diff options
Diffstat (limited to '')
| -rw-r--r-- | proto/postconf.proto | 738 |
1 files changed, 566 insertions, 172 deletions
diff --git a/proto/postconf.proto b/proto/postconf.proto index f52f37f..d13719b 100644 --- a/proto/postconf.proto +++ b/proto/postconf.proto @@ -489,8 +489,14 @@ alias_database = hash:/etc/mail/aliases %PARAM alias_maps see "postconf -d" output <p> -The alias databases that are used for local(8) delivery. See -aliases(5) for syntax details. +Optional lookup tables with aliases that apply only to local(8) +recipients; this is unlike virtual_alias_maps that apply to all +recipients: local(8), virtual, and remote. +The table format and lookups are documented in aliases(5). For an +overview of Postfix address manipulations see the ADDRESS_REWRITING_README +document. </p> + +<p> Specify zero or more "type:name" lookup tables, separated by whitespace or comma. Tables will be searched in the specified order until a match is found. @@ -1315,19 +1321,30 @@ name of the message delivery transport. <p> The default mail delivery transport and next-hop destination for -destinations that do not match $mydestination, $inet_interfaces, +the default domain class: recipient domains that do not match +$mydestination, $inet_interfaces, $proxy_interfaces, $virtual_alias_domains, $virtual_mailbox_domains, -or $relay_domains. This information can be overruled with the -sender_dependent_default_transport_maps parameter and with the -transport(5) table. </p> +or $relay_domains. This information will not be used when +sender_dependent_default_transport_maps returns a result, and may +be overridden with the transport(5) table. </p> -<p> -In order of decreasing precedence, the nexthop destination is taken -from $sender_dependent_default_transport_maps, $default_transport, -$sender_dependent_relayhost_maps, $relayhost, or from the recipient -domain. +<p> For recipient domains in the default domain class: <p> + +<ul> + +<li> <p> In order of decreasing precedence, the delivery transport +is taken from 1) $transport_maps, 2) +$sender_dependent_default_transport_maps or $default_transport. </p> +<li> <p> In order of decreasing precedence, the nexthop destination +is taken from 1) $transport_maps, 2) +$sender_dependent_default_transport_maps or $default_transport, 3) +$sender_dependent_relayhost_maps or $relayhost or the recipient +domain. </p> + +</ul> + <p> Specify a string of the form <i>transport:nexthop</i>, where <i>transport</i> is the name of a mail delivery transport defined in master.cf. @@ -1766,7 +1783,7 @@ forward_expansion_filter parameter. </p> <dd>The address extension delimiter that was found in the recipient address (Postfix 2.11 and later), or the 'first' delimiter specified with the system-wide recipient address extension delimiter (Postfix -3.5.22, 3.5.12, 3.7.8, 3.8.3 and later). Historically, this was +3.5.22, 3.6.12, 3.7.8, 3.8.3 and later). Historically, this was always the system-wide recipient address extension delimiter (Postfix 2.10 and earlier). </dd> @@ -1999,12 +2016,17 @@ Specify 0 to disable the feature. Valid delays are 0..10. %PARAM inet_interfaces all -<p> The local network interface addresses that this mail system receives -mail on. Specify "all" to receive mail on all network -interfaces (default), and "loopback-only" to receive mail -on loopback network interfaces only (Postfix version 2.2 and later). The -parameter also controls delivery of mail to <tt>user@[ip.address]</tt>. -</p> +<p> The local network interface addresses that this mail system +receives mail on. Specify "all" to receive mail on all network +interfaces (default), "loopback-only" to receive mail on loopback +network interfaces only (Postfix version 2.2 and later), or zero +or more IPv4 or IPv6 addresses (IPv6 is supported in Postfix version +2.2 and later). The parameter also controls whether Postfix will +accept mail for <tt>user@[ip.address]</tt>, and prevents Postfix +from delivering mail to a host that has equal or larger MX preference. +Specify an empty value if Postfix does not receive mail over the +network, or if all network listeners have an explicit IP address +in master.cf. </p> <p> Note 1: you need to stop and start Postfix when this parameter changes. @@ -2013,22 +2035,44 @@ Note 1: you need to stop and start Postfix when this parameter changes. <p> Note 2: address information may be enclosed inside <tt>[]</tt>, but this form is not required here. </p> -<p> When inet_interfaces specifies just one IPv4 and/or IPv6 address -that is not a loopback address, the Postfix SMTP client will use -this address as the IP source address for outbound mail. Support -for IPv6 is available in Postfix version 2.2 and later. </p> +<p> When smtp_bind_address and/or smtp_bind_address6 are not +specified, the inet_interfaces setting may constrain the source IP +address for an outbound SMTP or LMTP connection as described below. +</p> -<p> -On a multi-homed firewall with separate Postfix instances listening on the -"inside" and "outside" interfaces, this can prevent each instance from -being able to reach remote SMTP servers on the "other side" of the -firewall. Setting -smtp_bind_address to 0.0.0.0 avoids the potential problem for -IPv4, and setting smtp_bind_address6 to :: solves the problem -for IPv6. </p> +<p> The following text is specific to SMTP and IPv4. The same +reasoning applies to the IPv6 protocol, and to the Postfix LMTP +client. To disable IPv4 or IPv6 support in the Postfix SMTP and +LMTP client, use inet_protocols. </p> + +<ul> + +<li> <p> When inet_interfaces specifies one IPv4 address, and that +is not a loopback address, the Postfix SMTP client uses that as the +source address for outbound IPv4 connections. </p> + +<li> <p> Otherwise, the Postfix SMTP client does not constrain the +source IPv4 address, and connects using a system-chosen source IPv4 +address. This includes the cases where inet_interfaces is empty, +where it specifies <b>all</b>, or where it contains no IPv4 address, +one IPv4 address that is a loopback address, or multiple IPv4 +addresses. </p> + +</ul> + +<p> A Postfix SMTP client may fail to reach some remote SMTP servers +when the client source IP address is constrained explicitly with +smtp_bind_address or smtp_bind_address6, or implicitly with +inet_interfaces. This can happen when Postfix runs on a multi-homed +system such as a firewall, the Postfix SMTP source client IP address +is constrained to one specific network interface, and the remote +SMTP server must be reached through a different interface. Setting +smtp_bind_address to 0.0.0.0 avoids the potential problem for IPv4, +and setting smtp_bind_address6 to :: solves the problem for IPv6. +</p> <p> -A better solution for multi-homed firewalls is to leave inet_interfaces +A better solution for multi-homed systems is to leave inet_interfaces at the default value and instead use explicit IP addresses in the master.cf SMTP server definitions. This preserves the Postfix SMTP client's @@ -2056,7 +2100,7 @@ inet_interfaces = 127.0.0.1, [::1] (Postfix version 2.2 and later) inet_interfaces = 192.168.1.2, 127.0.0.1 </pre> -%PARAM inet_protocols see 'postconf -d output' +%PARAM inet_protocols see 'postconf -d' output <p> The Internet protocols Postfix will attempt to use when making or accepting connections. Specify one or more of "ipv4" @@ -2427,8 +2471,8 @@ until a match is found. <p> If this parameter is non-empty (the default), then the Postfix SMTP -server will reject mail for unknown local users. -</p> +server will reject mail for unknown local users. Other Postfix +interfaces may still accept an "unknown" recipient. </p> <p> To turn off local recipient checking in the Postfix SMTP server, @@ -2689,6 +2733,11 @@ and later.</dd> <dd>The domain part of the recipient address. </dd> +<dt><b>ENVID</b></dt> + +<dd>The optional RFC 3461 envelope ID. Available in Postfix version +3.9 and later</dd> + <dt><b>EXTENSION</b></dt> <dd>The optional address extension. </dd> @@ -3849,13 +3898,31 @@ This feature is available in Postfix 2.0 and later. %PARAM relayhost <p> -The next-hop destination(s) for non-local mail; overrides non-local -domains in recipient addresses. This information is overruled with -relay_transport, sender_dependent_default_transport_maps, -default_transport, sender_dependent_relayhost_maps -and with the transport(5) table. +The next-hop destination(s) for non-local mail; takes precedence +over non-local domains in recipient addresses. This information +will not be used when the sender matches $sender_dependent_relayhost_maps. </p> +<p> In order of decreasing precedence: </p> + +<ul> + +<li> <p> For recipient domains in the relay domain address class +(domains matching $relay_domains), the nexthop destination is taken +from 1) $transport_maps, 2) $relay_transport, 3) +$sender_dependent_relayhost_maps or $relayhost or the recipient +domain. <p> + +<li> <p> For recipient domains in the default domain address class +(domains that do not match $mydestination, $inet_interfaces, +$proxy_interfaces, $virtual_alias_domains, $virtual_mailbox_domains, +or $relay_domains), the nexthop destination is taken from 1) +$transport_maps, 2) $sender_dependent_default_transport_maps or +$default_transport, 3) $sender_dependent_relayhost_maps or $relayhost +or the recipient domain. </p> + +</ul> + <p> On an intranet, specify the organizational domain name. If your internal DNS uses no MX records, specify the name of the intranet @@ -3863,11 +3930,12 @@ gateway host instead. </p> <p> -In the case of SMTP or LMTP delivery, specify one or more destinations -in the form of a domain name, hostname, hostname:port, [hostname]:port, -[hostaddress] or [hostaddress]:port, separated by comma or whitespace. -The form [hostname] turns off MX lookups. Multiple destinations are -supported in Postfix 3.5 and later. +In the case of SMTP delivery, specify one or more destinations in +the form of a domain name, hostname, hostname:service, [hostname]:service, +[hostaddress] or [hostaddress]:service, separated by comma or whitespace. +The form [hostname] turns off MX or SRV lookups. Multiple destinations +are supported in Postfix 3.5 and later. Each destination is tried +in the specified order. </p> <p> @@ -4628,6 +4696,9 @@ If no username:password entry is found, then the Postfix SMTP client will not attempt to authenticate to the remote host. </p> +<p> Use smtp_sasl_password_result_delimiter to specify an +alternative separator between username and password. </p> + <p> The Postfix SMTP client opens the lookup table before going to chroot jail, so you can leave the password file in /etc/postfix. @@ -4639,6 +4710,19 @@ whitespace or comma. Tables will be searched in the specified order until a match is found. </p> +%PARAM lmtp_sasl_password_result_delimiter : + +<p> The LMTP-specific version of the smtp_sasl_password_result_delimiter +configuration parameter. See there for details. </p> + +%PARAM smtp_sasl_password_result_delimiter : + +<p> The delimiter between username and password in sasl_passwd_maps lookup +results. Specify one non-whitespace character that does not appear in +the username. </p> + +<p> This feature is available in Postfix ≥ 3.9. </p> + %PARAM smtp_sasl_security_options noplaintext, noanonymous <p> Postfix SMTP client SASL security options; as of Postfix 2.3 @@ -5219,9 +5303,8 @@ pubkey_fingerprint } } </dd> <dt><b><a name="check_client_access">check_client_access</a> <i><a href="DATABASE_README.html">type:table</a></i></b></dt> -<dd>Search the specified access database for the client hostname, -parent domains, client IP address, or networks obtained by stripping -least significant octets. See the access(5) manual page for details. </dd> +<dd>Search the specified access database for the client hostname +or IP address. See the access(5) manual page for details. </dd> <dt><b><a name="check_client_a_access">check_client_a_access</a> <i><a href="DATABASE_README.html">type:table</a></i></b></dt> @@ -5252,8 +5335,7 @@ available in Postfix 2.7 and later. </dd> <dt><b><a name="check_reverse_client_hostname_access">check_reverse_client_hostname_access</a> <i><a href="DATABASE_README.html">type:table</a></i></b></dt> <dd>Search the specified access database for the unverified reverse -client hostname, parent domains, client IP address, or networks -obtained by stripping least significant octets. See the access(5) +client hostname or IP address. See the access(5) manual page for details. Note: a result of "OK" is not allowed for safety reasons. Instead, use DUNNO in order to exclude specific hosts from denylists. This feature is available in Postfix 2.6 @@ -5726,8 +5808,8 @@ received with the ETRN command. <dt><b><a name="check_etrn_access">check_etrn_access</a> <i><a href="DATABASE_README.html">type:table</a></i></b></dt> -<dd>Search the specified access database for the ETRN domain name -or its parent domains. See the access(5) manual page for details. +<dd>Search the specified access database for the ETRN domain name. +See the access(5) manual page for details. </dd> </dl> @@ -5842,7 +5924,7 @@ received with the HELO or EHLO command. <dt><b><a name="check_helo_access">check_helo_access</a> <i><a href="DATABASE_README.html">type:table</a></i></b></dt> <dd>Search the specified access(5) database for the HELO or EHLO -hostname or parent domains, and execute the corresponding action. +hostname, and execute the corresponding action. Note: specify "smtpd_helo_required = yes" to fully enforce this restriction (without "smtpd_helo_required = yes", a client can simply skip check_helo_access by not sending HELO or EHLO). </dd> @@ -6137,8 +6219,7 @@ that is received with the RCPT TO command. <dt><b><a name="check_recipient_access">check_recipient_access</a> <i><a href="DATABASE_README.html">type:table</a></i></b></dt> <dd>Search the specified access(5) database for the resolved RCPT -TO address, domain, parent domains, or localpart@, and execute the -corresponding action. </dd> +TO address, and execute the corresponding action. </dd> <dt><b><a name="check_recipient_a_access">check_recipient_a_access</a> <i><a href="DATABASE_README.html">type:table</a></i></b></dt> @@ -6388,7 +6469,7 @@ The same restrictions are available as documented under smtpd_recipient_restrictions. </p> -<p> This feature is available in Postix 2.10 and later. </p> +<p> This feature is available in Postfix 2.10 and later. </p> %CLASS sasl-auth SASL Authentication @@ -6652,8 +6733,7 @@ received with the MAIL FROM command. <dt><b><a name="check_sender_access">check_sender_access</a> <i><a href="DATABASE_README.html">type:table</a></i></b></dt> <dd>Search the specified access(5) database for the MAIL FROM -address, domain, parent domains, or localpart@, and execute the -corresponding action. </dd> +address, and execute the corresponding action. </dd> <dt><b><a name="check_sender_a_access">check_sender_a_access</a> <i><a href="DATABASE_README.html">type:table</a></i></b></dt> @@ -6967,7 +7047,14 @@ while accessing the Postfix main.cf configuration file. <p> Optional lookup tables with mappings from recipient address to (message delivery transport, next-hop destination). See transport(5) -for details. +for syntax details. +</p> + +<p> This information may override the message delivery transport +and/or next-hop destination that are specified with $local_transport, +$virtual_transport, $relay_transport, $default_transport, +$sender_dependent_relayhost_maps, $relayhost, +$sender_dependent_default_transport_maps, or the recipient domain. </p> <p> @@ -7224,8 +7311,10 @@ This feature is available in Postfix 2.1 and later. %PARAM virtual_alias_maps $virtual_maps <p> -Optional lookup tables that alias specific mail addresses or domains -to other local or remote addresses. The table format and lookups +Optional lookup tables with aliases that apply to all recipients: +local(8), virtual, and remote; this is unlike alias_maps that apply +only to local(8) recipients. +The table format and lookups are documented in virtual(5). For an overview of Postfix address manipulations see the ADDRESS_REWRITING_README document. </p> @@ -8457,13 +8546,24 @@ configure or operate a specific Postfix subsystem or feature. <p> The default mail delivery transport and next-hop destination for -remote delivery to domains listed with $relay_domains. In order of -decreasing precedence, the nexthop destination is taken from -$relay_transport, $sender_dependent_relayhost_maps, $relayhost, or -from the recipient domain. This information can be overruled with -the transport(5) table. +the relay domain address class: recipient domains that match +$relay_domains. </p> + +<p> For recipient domains in the relay domain address class: </p> + +<ul> + +<li> <p> In order of decreasing precedence, the message delivery +transport is taken from 1) $transport_maps, 2) $relay_transport. </p> +<li> <p> In order of decreasing precedence, the nexthop destination +is taken from 1) $transport_maps, 2) $relay_transport, 3) +$sender_dependent_relayhost_maps or $relayhost or the recipient +domain. </p> + +</ul> + <p> Specify a string of the form <i>transport:nexthop</i>, where <i>transport</i> is the name of a mail delivery transport defined in master.cf. @@ -9698,7 +9798,9 @@ if client certificate verification is not required. With Postfix 2.8 and earlier, log the summary message, peer certificate summary information and unconditionally log trust-chain verification errors. </dd> -<dt> </dt> <dd> 2 Also log levels during TLS negotiation. </dd> +<dt> </dt> <dd> 2 Also enable verbose logging in the Postfix TLS +library, log session cache operations, and enable OpenSSL logging +of the progress of the SSL handshake. </dd> <dt> </dt> <dd> 3 Also log hexadecimal and ASCII dump of TLS negotiation process. </dd> @@ -9733,6 +9835,9 @@ but do not require that clients use TLS encryption. </p> STARTTLS due to insufficient privileges to access the server private key. This is intended behavior. </p> +<p> This feature is deprecated as of Postfix 3.9. Specify +smtpd_tls_security_level instead. </p> + <p> This feature is available in Postfix 2.2 and later. With Postfix 2.3 and later use smtpd_tls_security_level instead. </p> @@ -9749,6 +9854,9 @@ server. This option is therefore off by default. </p> STARTTLS due to insufficient privileges to access the server private key. This is intended behavior. </p> +<p> This feature is deprecated as of Postfix 3.9. Specify +smtpd_tls_security_level instead. </p> + <p> This feature is available in Postfix 2.2 and later. With Postfix 2.3 and later use smtpd_tls_security_level instead. </p> @@ -10179,7 +10287,9 @@ verification errors if server certificate verification is not required. With Postfix 2.8 and earlier, log the summary message and unconditionally log trust-chain verification errors. </dd> -<dt> </dt> <dd> 2 Also log levels during TLS negotiation. </dd> +<dt> </dt> <dd> 2 Also enable verbose logging in the Postfix TLS +library, log session cache operations, and enable OpenSSL logging +of the progress of the SSL handshake. </dd> <dt> </dt> <dd> 3 Also log the hexadecimal and ASCII dump of the TLS negotiation process. </dd> @@ -10330,11 +10440,13 @@ lookup key, and overrides the global smtp_use_tls, smtp_enforce_tls, and smtp_tls_enforce_peername settings. </dd> <dt> MAY </dt> <dd> Try to use TLS if the server announces support, -otherwise use an unencrypted connection. This has less precedence +otherwise use an unencrypted connection; after a failed TLS handshake +or TLS session, fall back to plaintext if the message has spent +minimal_backoff_time in the mail queue. This level has less precedence than a more specific result (including <b>NONE</b>) from the alternate host or next-hop lookup key, and has less precedence than the more specific global "smtp_enforce_tls = yes" or "smtp_tls_enforce_peername -= yes". </dd> += yes". </dd> <dt> MUST_NOPEERMATCH </dt> <dd> Require TLS encryption, but do not require that the remote SMTP server hostname matches the information @@ -10703,9 +10815,28 @@ is placed into the Postfix configuration directory. </p> setting. The tables are searched by the envelope sender address and @domain. A lookup result of DUNNO terminates the search without overriding the global relayhost parameter setting (Postfix 2.6 and -later). This information is overruled with relay_transport, -sender_dependent_default_transport_maps, default_transport and with -the transport(5) table. </p> +later). </p> + +<p> In order of decreasing precedence: </p> + +<ul> + +<li> <p> For recipient domains in the relay domain address class +(domains matching $relay_domains), the nexthop destination is taken +from 1) $transport_maps, 2) $relay_transport, 3) +$sender_dependent_relayhost_maps or $relayhost or the recipient +domain. </p> + +<li> <p> For recipient domains in the default domain address class +(domains that do not match mydestination, $inet_interfaces, +$proxy_interfaces, $virtual_alias_domains, $virtual_mailbox_domains, +$relay_domains), the nexthop destination is taken from 1) +$transport_maps, 2) $sender_dependent_default_transport_maps or +$default_transport, 3) $sender_dependent_relayhost_maps or $relayhost +or the recipient domain. </p> + +</ul> + <p> Specify zero or more "type:name" lookup tables, separated by @@ -10868,6 +10999,9 @@ configuration parameter. See there for details. </p> <p> The LMTP-specific version of the smtp_tls_per_site configuration parameter. See there for details. </p> +<p> This feature is deprecated as of Postfix 3.9. Specify +lmtp_tls_policy_maps instead. </p> + <p> This feature is available in Postfix 2.3 and later. </p> %PARAM lmtp_generic_maps @@ -10973,6 +11107,9 @@ configuration parameter. See there for details. </p> <p> The LMTP-specific version of the smtp_use_tls configuration parameter. See there for details. </p> +<p> This feature is deprecated as of Postfix 3.9. Specify +lmtp_tls_security_level instead. </p> + <p> This feature is available in Postfix 2.3 and later. </p> %PARAM lmtp_enforce_tls no @@ -10980,6 +11117,9 @@ parameter. See there for details. </p> <p> The LMTP-specific version of the smtp_enforce_tls configuration parameter. See there for details. </p> +<p> This feature is deprecated as of Postfix 3.9. Specify +lmtp_tls_security_level instead. </p> + <p> This feature is available in Postfix 2.3 and later. </p> %PARAM lmtp_tls_security_level @@ -11350,28 +11490,35 @@ security are: </p> <dd>Opportunistic TLS. Since sending in the clear is acceptable, demanding stronger than default TLS security merely reduces interoperability. The optional "ciphers", "exclude", and "protocols" -attributes (available for opportunistic TLS with Postfix ≥ 2.6) -and "connection_reuse" attribute (Postfix ≥ 3.4) override the +attributes (available for opportunistic TLS with Postfix ≥ 2.6) and +"connection_reuse" attribute (Postfix ≥ 3.4) override the "smtp_tls_ciphers", "smtp_tls_exclude_ciphers", "smtp_tls_protocols", -and -"smtp_tls_connection_reuse" configuration parameters. In the policy table, -multiple ciphers, protocols or excluded ciphers must be separated by colons, -as attribute values may not contain whitespace or commas. When opportunistic -TLS handshakes fail, Postfix retries the connection with TLS disabled. -This allows mail delivery to sites with non-interoperable TLS -implementations.</dd> +and "smtp_tls_connection_reuse" configuration parameters. In the policy +table, multiple ciphers, protocols or excluded ciphers must be separated +by colons, as attribute values may not contain whitespace or commas. At +this level and higher, the optional "servername" attribute (available +with Postfix ≥ 3.4) overrides the global "smtp_tls_servername" +parameter, enabling per-destination configuration of the SNI extension +sent to the remote SMTP server. The optional "enable_rpk" attribute +(Postfix ≥ 3.9) overrides the main.cf smtp_tls_enable_rpk parameter. +When opportunistic TLS handshakes fail, Postfix retries the connection +with TLS disabled. This allows mail delivery to sites with +non-interoperable TLS implementations.</dd> <dt><b><a href="TLS_README.html#client_tls_encrypt">encrypt</a></b></dt> -<dd>Mandatory TLS encryption. At this level -and higher, the optional "protocols" attribute overrides the main.cf +<dd>Mandatory TLS encryption. Mail is delivered only if the remote SMTP +server offers STARTTLS and the TLS handshake succeeds. At this level and +higher, the optional "protocols" attribute overrides the main.cf smtp_tls_mandatory_protocols parameter, the optional "ciphers" attribute -overrides the main.cf smtp_tls_mandatory_ciphers parameter, the -optional "exclude" attribute (Postfix ≥ 2.6) overrides the main.cf +overrides the main.cf smtp_tls_mandatory_ciphers parameter, the optional +"exclude" attribute (Postfix ≥ 2.6) overrides the main.cf smtp_tls_mandatory_exclude_ciphers parameter, and the optional -"connection_reuse" attribute (Postfix ≥ 3.4) overrides the -main.cf smtp_tls_connection_reuse parameter. In the policy table, -multiple ciphers, protocols or excluded ciphers must be separated by colons, -as attribute values may not contain whitespace or commas. </dd> +"connection_reuse" attribute (Postfix ≥ 3.4) overrides the main.cf +smtp_tls_connection_reuse parameter. In the policy table, multiple +ciphers, protocols or excluded ciphers must be separated by colons, as +attribute values may not contain whitespace or commas. The optional +"enable_rpk" attribute (Postfix ≥ 3.9) overrides the main.cf +smtp_tls_enable_rpk parameter. </dd> <dt><b><a href="TLS_README.html#client_tls_dane">dane</a></b></dt> <dd>Opportunistic DANE TLS. The TLS policy for the destination is @@ -11416,10 +11563,10 @@ configuration parameters. The optional "connection_reuse" attribute verification. Available with Postfix 2.5 and later. At this security level, there are no trusted Certification Authorities. The certificate trust chain, expiration date, ... are not checked. Instead, -the optional "match" attribute, or else the main.cf +the optional policy table "match" attribute, or else the main.cf <b>smtp_tls_fingerprint_cert_match</b> parameter, lists the certificate -fingerprints or the public key fingerprint (Postfix 2.9 and later) -of the valid server certificate. The digest +fingerprints or the public key fingerprints (Postfix 2.9 and later) +of acceptable server certificates. The digest algorithm used to calculate the fingerprint is selected by the <b>smtp_tls_fingerprint_digest</b> parameter. Multiple fingerprints can be combined with a "|" delimiter in a single match attribute, or multiple @@ -11430,45 +11577,58 @@ digits. The optional "ciphers", "exclude", and "protocols" attributes "smtp_tls_mandatory_exclude_ciphers", and "smtp_tls_mandatory_protocols" configuration parameters. The optional "connection_reuse" attribute (Postfix ≥ 3.4) overrides the main.cf smtp_tls_connection_reuse -parameter. </dd> +parameter. The optional "enable_rpk" attribute (Postfix ≥ 3.9) +overrides the main.cf smtp_tls_enable_rpk parameter. </dd> <dt><b><a href="TLS_README.html#client_tls_verify">verify</a></b></dt> -<dd>Mandatory TLS verification. At this security -level, DNS MX lookups are trusted to be secure enough, and the name -verified in the server certificate is usually obtained indirectly via -unauthenticated DNS MX lookups. The optional "match" attribute overrides -the main.cf smtp_tls_verify_cert_match parameter. In the policy table, -multiple match patterns and strategies must be separated by colons. -In practice explicit control over matching is more common with the -"secure" policy, described below. The optional "ciphers", "exclude", -and "protocols" attributes (Postfix ≥ 2.6) override the -"smtp_tls_mandatory_ciphers", "smtp_tls_mandatory_exclude_ciphers", and -"smtp_tls_mandatory_protocols" configuration parameters. The optional -"connection_reuse" attribute (Postfix ≥ 3.4) overrides the main.cf -smtp_tls_connection_reuse parameter. </dd> +<dd>Mandatory TLS verification. Mail is delivered only if the TLS +handshake succeeds, the remote SMTP server certificate chain can be +validated, and a DNS name in the certificate matches the specified match +criteria. At this security level, DNS MX lookups are presumed to be +secure enough, and the name verified in the server certificate is +potentially obtained via unauthenticated DNS MX lookups. The optional +"match" attribute overrides the main.cf smtp_tls_verify_cert_match +parameter. In the policy table, multiple match patterns and strategies +must be separated by colons. In practice explicit control over matching +is more common with the "secure" policy, described below. The optional +"ciphers", "exclude", and "protocols" attributes (Postfix ≥ 2.6) +override the "smtp_tls_mandatory_ciphers", +"smtp_tls_mandatory_exclude_ciphers", and "smtp_tls_mandatory_protocols" +configuration parameters. With Postfix ≥ 2.11 the optional "tafile" +policy table attribute modifies trust chain verification in the same +manner as the "smtp_tls_trust_anchor_file" parameter. The "tafile" +attribute may be specified multiple times to load multiple trust-anchor +files. The optional "connection_reuse" attribute (Postfix ≥ 3.4) +overrides the main.cf smtp_tls_connection_reuse parameter. </dd> <dt><b><a href="TLS_README.html#client_tls_secure">secure</a></b></dt> -<dd>Secure-channel TLS. At this security level, DNS -MX lookups, though potentially used to determine the candidate next-hop -gateway IP addresses, are <b>not</b> trusted to be secure enough for TLS -peername verification. Instead, the default name verified in the server -certificate is obtained directly from the next-hop, or is explicitly -specified via the optional "match" attribute which overrides the -main.cf smtp_tls_secure_cert_match parameter. In the policy table, -multiple match patterns and strategies must be separated by colons. -The match attribute is most useful when multiple domains are supported by -a common server: the policy entries for additional domains specify matching -rules for the primary domain certificate. While transport table overrides -that route the secondary domains to the primary nexthop also allow secure -verification, they risk delivery to the wrong destination when domains -change hands or are re-assigned to new gateways. With the "match" -attribute approach, routing is not perturbed, and mail is deferred if -verification of a new MX host fails. The optional "ciphers", "exclude", -and "protocols" attributes (Postfix ≥ 2.6) override the -"smtp_tls_mandatory_ciphers", "smtp_tls_mandatory_exclude_ciphers", and -"smtp_tls_mandatory_protocols" configuration parameters. The optional -"connection_reuse" attribute (Postfix ≥ 3.4) overrides the main.cf -smtp_tls_connection_reuse parameter. </dd> +<dd>Secure certificate verification. Mail is delivered only if the TLS +handshake succeeds, the remote SMTP server certificate chain can be +validated, and a DNS name in the certificate matches the specified match +criteria. At this security level, DNS MX lookups, though potentially +used to determine the candidate next-hop gateway IP addresses, are +<b>not</b> presumed to be secure enough for TLS peername verification. +Instead, the default name verified in the server certificate is obtained +directly from the next-hop, or is explicitly specified via the optional +"match" attribute which overrides the main.cf smtp_tls_secure_cert_match +parameter. In the policy table, multiple match patterns and strategies +must be separated by colons. The match attribute is most useful when +multiple domains are supported by a common server: the policy entries +for additional domains specify matching rules for the primary domain +certificate. While transport table overrides that route the secondary +domains to the primary nexthop also allow secure verification, they risk +delivery to the wrong destination when domains change hands or are +re-assigned to new gateways. With the "match" attribute approach, +routing is not perturbed, and mail is deferred if verification of a new +MX host fails. The optional "ciphers", "exclude", and "protocols" +attributes (Postfix ≥ 2.6) override the "smtp_tls_mandatory_ciphers", +"smtp_tls_mandatory_exclude_ciphers", and "smtp_tls_mandatory_protocols" +configuration parameters. With Postfix ≥ 2.11 the "tafile" attribute +optionally modifies trust chain verification in the same manner as the +"smtp_tls_trust_anchor_file" parameter. The "tafile" attribute may be +specified multiple times to load multiple trust-anchor files. The +optional "connection_reuse" attribute (Postfix ≥ 3.4) overrides the +main.cf smtp_tls_connection_reuse parameter. </dd> </dl> @@ -11724,7 +11884,7 @@ configuration parameter. See there for details. </p> <p> This feature is available in Postfix 2.3 and later. </p> -%PARAM lmtp_tls_mandatory_protocols see postconf -d output +%PARAM lmtp_tls_mandatory_protocols see 'postconf -d' output <p> The LMTP-specific version of the smtp_tls_mandatory_protocols configuration parameter. See there for details. </p> @@ -11831,7 +11991,9 @@ destinations via smtp_tls_policy_maps. </dd> <dt><b><a href="TLS_README.html#client_tls_may">may</a></b></dt> <dd> Opportunistic TLS. Use TLS if this is supported by the remote -SMTP server, otherwise use plaintext. Since +SMTP server, otherwise use plaintext; after a failed TLS handshake +or TLS session, fall back to plaintext if the message has spent +minimal_backoff_time in the mail queue. Since sending in the clear is acceptable, demanding stronger than default TLS security merely reduces interoperability. The "smtp_tls_ciphers" and "smtp_tls_protocols" (Postfix ≥ 2.6) @@ -12902,7 +13064,7 @@ the hostname and IP address. The logging format is "host[address]:port". <p> This feature is available in Postfix 2.5 and later. </p> -%PARAM smtp_tls_protocols see postconf -d output +%PARAM smtp_tls_protocols see 'postconf -d' output <p> TLS protocols that the Postfix SMTP client will use with opportunistic TLS encryption. In main.cf the values are separated by @@ -12982,7 +13144,7 @@ smtp_tls_protocols = !SSLv2, !SSLv3 <p> This feature is available in Postfix 2.6 and later. </p> -%PARAM smtpd_tls_protocols see postconf -d output +%PARAM smtpd_tls_protocols see 'postconf -d' output <p> TLS protocols accepted by the Postfix SMTP server with opportunistic TLS encryption. If the list is empty, the server supports all available @@ -13048,7 +13210,7 @@ smtpd_tls_protocols = !SSLv2, !SSLv3 <p> This feature is available in Postfix 2.6 and later. </p> -%PARAM lmtp_tls_protocols see postconf -d output +%PARAM lmtp_tls_protocols see 'postconf -d' output <p> The LMTP-specific version of the smtp_tls_protocols configuration parameter. See there for details. </p> @@ -14353,9 +14515,9 @@ receive a 421 response. </p> %PARAM postscreen_greet_ttl 1d -<p> The amount of time that postscreen(8) will use the result from -a successful PREGREET test. During this time, the client IP address -is excluded from this test. The default is relatively short, because +<p> The amount of time that postscreen(8) remembers that a client +IP address passed a PREGREET test, before it is required to pass +that test again. The default is relatively short, because a good client can immediately talk to a real Postfix SMTP server. </p> <p> Specify a non-zero time value (an integral value plus an optional @@ -14813,18 +14975,38 @@ address and @domain. A lookup result of DUNNO terminates the search without overriding the global default_transport parameter setting. This information is overruled with the transport(5) table. </p> -<p> -Specify zero or more "type:name" lookup tables, separated by -whitespace or comma. Tables will be searched in the specified order -until a match is found. +<p> This setting affects only the default domain address class +(recipient domains that do not match $mydestination, $inet_interfaces, +$proxy_interfaces, $virtual_alias_domains, $virtual_mailbox_domains, +or $relay_domains): </p> + +<ul> + +<li> <p> In order of decreasing precedence, the delivery transport +is taken from 1) $transport_maps, 2) +$sender_dependent_default_transport_maps or $default_transport. </p> +<li> <p> In order of decreasing precedence, the nexthop destination +is taken from 1) $transport_maps, 2) +$sender_dependent_default_transport_maps or $default_transport, 3) +$sender_dependent_relayhost_maps or $relayhost or the recipient +domain. </p> + +</ul> + <p> Note: this overrides default_transport, not transport_maps, and therefore the expected syntax is that of default_transport, not the syntax of transport_maps. Specifically, this does not support the transport_maps syntax for null transport, null nexthop, or null email addresses. </p> +<p> +Specify zero or more "type:name" lookup tables, separated by +whitespace or comma. Tables will be searched in the specified order +until a match is found. +</p> + <p> For safety reasons, this feature does not allow $number substitutions in regular expression maps. </p> @@ -14865,13 +15047,38 @@ IPv6 connectivity: </p> <ul> <li> <p> The setting "smtp_address_preference = ipv6" is unsafe. -It can fail to deliver mail when there is an outage that affects -IPv6, while the destination is still reachable over IPv4. </p> +All deliveries will suffer delays during an IPv6 outage, even +while the destination is still reachable over IPv4. Mail may be +stuck in the queue with Postfix versions < 3.3 that do not +implement "smtp_balance_inet_protocols". For similar reasons, the +setting "smtp_address_preference = ipv4" is also unsafe. </p> <li> <p> The setting "smtp_address_preference = any" is safe. With -this, mail will eventually be delivered even if there is an outage +this, and "smtp_balance_inet_protocols = yes" (the default), only +half of deliveries will suffer delays if there is an outage that affects IPv6 or IPv4, as long as it does not affect both. </p> +<li> <p> The setting "smtp_address_preference = ipv4" is not a +solution for remote servers that flag email received over IPv6 as +more 'spammy' (the client IPv6 address has a bad or missing PTR or +AAAA record, bad network neighbors, etc.). Instead, configure Postfix +to receive mail over both IPv4 and IPv6, and to deliver mail over +only IPv4. </p> + +<blockquote> +<pre> +/etc/postfix/main.cf: + inet_protocols = all +</pre> +</blockquote> + +<blockquote> +<pre> +/etc/postfix/master.cf + smtp ...other fields... smtp -o inet_protocols=ipv4 +</pre> +</blockquote> + </ul> <p> This feature is available in Postfix 2.8 and later. </p> @@ -14938,9 +15145,10 @@ defined with the postscreen_dnsbl_sites parameter. </p> <p> Specify a negative value to enable this feature. When a client passes the postscreen_dnsbl_allowlist_threshold without having failed other tests, all pending or disabled tests are flagged as -completed with a time-to-live value equal to postscreen_dnsbl_ttl. -When a test was already completed, its time-to-live value is updated -if it was less than postscreen_dnsbl_ttl. </p> +completed with an expiration time based on the DNS reply TTL. +When a test was already completed, its expiration time is updated +if it was less than the value based on the DNS reply TTL. See +also postscreen_dnsbl_max_ttl and postscreen_dnsbl_min_ttl. </p> <p> This feature is available in Postfix 3.6 and later. </p> @@ -14966,9 +15174,9 @@ built-in SMTP protocol engine. </p> %PARAM postscreen_dnsbl_ttl 1h -<p> The amount of time that postscreen(8) will use the result from -a successful DNS-based reputation test before a client -IP address is required to pass that test again. </p> +<p> The amount of time that postscreen(8) remembers that a client +IP address passed a DNS-based reputation test, before it is required +to pass that test again. </p> <p> Specify a non-zero time value (an integral value plus an optional one-letter suffix that specifies the time unit). Time units: s @@ -14980,9 +15188,9 @@ replaced by postscreen_dnsbl_max_ttl in Postfix 3.1. </p> %PARAM postscreen_dnsbl_min_ttl 60s -<p> The minimum amount of time that postscreen(8) will use the -result from a successful DNS-based reputation test before a -client IP address is required to pass that test again. If the DNS +<p> The minimum amount of time that postscreen(8) remembers that a +client IP address passed a DNS-based reputation test, before it +is required to pass that test again. If the DNS reply specifies a larger TTL value, that value will be used unless it would be larger than postscreen_dnsbl_max_ttl. </p> @@ -14995,9 +15203,9 @@ The default time unit is s (seconds). </p> %PARAM postscreen_dnsbl_max_ttl ${postscreen_dnsbl_ttl?{$postscreen_dnsbl_ttl}:{1}}h -<p> The maximum amount of time that postscreen(8) will use the -result from a successful DNS-based reputation test before a -client IP address is required to pass that test again. If the DNS +<p> The maximum amount of time that postscreen(8) remembers that a +client IP address passed a DNS-based reputation test, before it is +required to pass that test again. If the DNS reply specifies a shorter TTL value, that value will be used unless it would be smaller than postscreen_dnsbl_min_ttl. </p> @@ -15043,9 +15251,9 @@ this test the next time the client connects. </dd> %PARAM postscreen_pipelining_ttl 30d -<p> The amount of time that postscreen(8) will use the result from -a successful "pipelining" SMTP protocol test. During this time, the -client IP address is excluded from this test. The default is +<p> The amount of time that postscreen(8) remembers that a client +IP address passed a "pipelining" SMTP protocol test, before it is +required to pass that test again. The default is long because a good client must disconnect after it passes the test, before it can talk to a real Postfix SMTP server. </p> @@ -15140,9 +15348,9 @@ feature. </dd> %PARAM postscreen_non_smtp_command_ttl 30d -<p> The amount of time that postscreen(8) will use the result from -a successful "non_smtp_command" SMTP protocol test. During this -time, the client IP address is excluded from this test. The default +<p> The amount of time that postscreen(8) remembers that a client +IP address passed a "non_smtp_command" SMTP protocol test, before +it is required to pass that test again. The default is long because a client must disconnect after it passes the test, before it can talk to a real Postfix SMTP server. </p> @@ -15233,9 +15441,9 @@ this test the next time the client connects. </dd> %PARAM postscreen_bare_newline_ttl 30d -<p> The amount of time that postscreen(8) will use the result from -a successful "bare newline" SMTP protocol test. During this -time, the client IP address is excluded from this test. The default +<p> The amount of time that postscreen(8) remembers that a client +IP address passed a "bare newline" SMTP protocol test, before it +address is required to pass that test again. The default is long because a remote SMTP client must disconnect after it passes the test, before it can talk to a real Postfix SMTP server. </p> @@ -15542,6 +15750,9 @@ for details. </p> require that clients use TLS encryption. See smtpd_enforce_tls for further details. Use tlsproxy_tls_security_level instead. </p> +<p> This feature is deprecated as of Postfix 3.9. Specify +tlsproxy_tls_security_level instead. </p> + <p> This feature is available in Postfix 2.8 and later. </p> %PARAM tlsproxy_tls_CAfile $smtpd_tls_CAfile @@ -15616,6 +15827,8 @@ smtpd_tls_dcert_file for further details. </p> should use with non-export EDH ciphers. See smtpd_tls_dh1024_param_file for further details. </p> +<p> This feature is deprecated as of Postfix 3.9. Do not specify. </p> + <p> This feature is available in Postfix 2.8 and later. </p> %PARAM tlsproxy_tls_dh512_param_file $smtpd_tls_dh512_param_file @@ -15668,6 +15881,8 @@ the "tlsproxy_tls_chain_files" parameter. </p> elliptic-curve Diffie-Hellman (EECDH) key exchange. See smtpd_tls_eecdh_grade for further details. </p> +<p> This feature is deprecated as of Postfix 3.9. Do not specify. </p> + <p> This feature is available in Postfix 2.8 and later. </p> %PARAM tlsproxy_tls_exclude_ciphers $smtpd_tls_exclude_ciphers @@ -15772,6 +15987,9 @@ shared by all three services, namely smtpd_tls_session_cache_timeout. </p> but do not require that clients use TLS encryption. See smtpd_use_tls for further details. Use tlsproxy_tls_security_level instead. </p> +<p> This feature is deprecated as of Postfix 3.9. Specify +tlsproxy_tls_security_level instead. </p> + <p> This feature is available in Postfix 2.8 and later. </p> %PARAM smtpd_reject_footer @@ -17575,6 +17793,9 @@ was previously called tlsproxy_client_level. </p> usage policy by next-hop destination and by remote TLS server hostname. See smtp_tls_per_site for further details. </p> +<p> This feature is deprecated as of Postfix 3.9. Specify +tlsproxy_client_policy_maps instead. </p> + <p> This feature is available in Postfix 3.4 and later. </p> %PARAM tlsproxy_client_policy $smtp_tls_policy_maps @@ -17601,6 +17822,9 @@ was previously called tlsproxy_client_policy. </p> support. See smtp_use_tls for further details. Use tlsproxy_client_security_level instead. </p> +<p> This feature is deprecated as of Postfix 3.9. Specify +tlsproxy_client_security_level instead. </p> + <p> This feature is available in Postfix 3.4 and later. </p> %PARAM tlsproxy_client_enforce_tls $smtp_enforce_tls @@ -17609,6 +17833,9 @@ tlsproxy_client_security_level instead. </p> See smtp_enforce_tls for further details. Use tlsproxy_client_security_level instead. </p> +<p> This feature is deprecated as of Postfix 3.9. Specify +tlsproxy_client_security_level instead. </p> + <p> This feature is available in Postfix 3.4 and later. </p> %PARAM smtpd_tls_chain_files @@ -18145,6 +18372,17 @@ default suffix, YYYYMMDD-HHMMSS, allows logs to be rotated frequently. <p> This feature is available in Postfix 3.4 and later. </p> +%PARAM maillog_file_permissions 0600 + +<p> The file access permissions that will be set when the file +$maillog_file is created for the first time, or when the file is +created after an existing file is rotated. Specify one of: <b>0600</b> +(only super-user read/write access), <b>0640</b> (adds 'group' read +access), or <b>0644</b> (also adds 'other' read access). The leading +'0' is optional. </p> + +<p> This feature is available in Postfix 3.9 and later. </p> + %PARAM info_log_address_format external <p> The email address form that will be used in non-debug logging @@ -18495,6 +18733,140 @@ configuration parameter. See there for details. </p> <p> This feature is available in Postfix 3.7 and later. </p> +%PARAM smtpd_tls_enable_rpk no + +<p> Request that remote SMTP clients send an RFC7250 raw public key +instead of an X.509 certificate, when asking for or requiring client +authentication. This feature is ignored when there is no raw public +key support in the local TLS implementation. </p> + +<p> The Postfix SMTP server will log a warning when "smtpd_tls_enable_rpk += yes", but the remote SMTP client sends a certificate, the +certificate's public key fingerprint does not match a check_ccert_access +table, while the certificate fingerprint does match a check_ccert_access +table. The remote SMTP client would lose access when it starts +sending a raw public key instead of a certificate, after its TLS +implementation is updated with raw public key support. </p> + +<p> The Postfix SMTP server always sends a raw public key instead +of a certificate, if solicited by the remote SMTP client and the +local TLS implementation supports raw public keys. If the client +sends a server name indication with an SNI TLS extension, and +tls_server_sni_maps is configured, the server will extract a raw +public key from the indicated certificate. </p> + +<p> Sample commands to compute certificate and public key SHA256 digests: </p> + +<pre> +# SHA256 digest of the first certificate in "cert.pem" +$ openssl x509 -in cert.pem -outform DER | openssl dgst -sha256 -c +</pre> + +<pre> +# SHA256 digest of the SPKI of the first certificate in "cert.pem" +$ openssl x509 -in cert.pem -pubkey -noout | + openssl pkey -pubin -outform DER | openssl dgst -sha256 -c +</pre> + +<pre> +# SHA256 digest of the SPKI of the first private key in "pkey.pem" +$ openssl pkey -in pkey.pem -pubout -outform DER | + openssl dgst -sha256 -c +</pre> + +<p> This feature is available in Postfix 3.9 and later. </p> + +%PARAM tlsproxy_tls_enable_rpk $smtpd_tls_enable_rpk + +<p> Request that remote SMTP clients send an RFC7250 raw public key +instead of an X.509 certificate, when asking or requiring client +authentication. See $smtpd_tls_enable_rpk for details. </p> + +<p> This feature is available in Postfix 3.9 and later. </p> + +%PARAM smtp_tls_enable_rpk no + +<p> Request that remote SMTP servers send an RFC7250 raw public key +instead of an X.509 certificate. This feature and the enable_rpk +policy attribute are ignored when there is no raw public key support +in the local TLS implementation. </p> + +<ul> + +<li> <p> At the "may", "encrypt" and "fingerprint" security levels, +with parameter setting "smtp_tls_enable_rpk = yes" or with "enable_rpk += yes" in a policy entry, the Postfix SMTP client will indicate in +the TLS handshake that it prefers to receive a raw server public +key, but it will still accept a server public key certificate. </p> + +<li> <p> At the "fingerprint" security level, with parameter setting +"smtp_tls_enable_rpk = yes" or with "enable_rpk = yes" in a policy +entry, server authentication based on certificate fingerprints +becomes more fragile. Even if the server private key and certificate +remain unchanged, the remote SMTP server will fail fingerprint +authentication (won't match the configured list of fingerprints) +when it starts sending a raw public key instead of a certificate, +after its TLS implementation is updated with raw public key support. +Therefore, <b>DO NOT</b> enable raw public keys to remote destinations +authenticated by server <b>certificate</b> fingerprints. You should +enable raw public keys only for servers matched via their public +key fingerprint. </p> + +<li> <p> At the "verify" and "secure" security levels, the Postfix +SMTP client always ignores the parameter setting smtp_tls_enable_rpk +or the enable_rpk policy attribute. </p> + +<li> <p> At the opportunistic "dane" security level, the Postfix +SMTP client ignores the parameter setting smtp_tls_enable_rpk or +the enable_rpk policy attribute (but it will respect them when it +falls back to the "may" or "encrypt" level). When all valid TLSA +records specify only server public keys (no certificates) and the +local TLS implementation supports raw public keys, the client will +indicate in the TLS handshake that it prefers to receive a raw +public key, but it will still accept a public key certificate. </p> + +<li> <p> At the mandatory "dane-only" security level, the Postfix +SMTP client always ignores the parameter setting smtp_tls_enable_rpk +or the enable_rpk policy attribute. When all valid TLSA records +specify only server public keys (no certificates) and the local TLS +implementation supports raw public keys, the client will indicate +in the TLS handshake that it prefers to receive a raw public key, +but it will still accept a public key certificate. </p> + +</ul> + +<p>The Postfix SMTP client is always willing to send raw public keys +to servers that solicit them when a client certificate is configured +and the local TLS implementation supports raw public keys. </p> + +<p> Sample commands to compute certificate and public key SHA256 digests: </p> + +<pre> +# SHA256 digest of the first certificate in "cert.pem" +$ openssl x509 -in cert.pem -outform DER | openssl dgst -sha256 -c +</pre> + +<pre> +# SHA256 digest of the SPKI of the first certificate in "cert.pem" +$ openssl x509 -in cert.pem -pubkey -noout | + openssl pkey -pubin -outform DER | openssl dgst -sha256 -c +</pre> + +<pre> +# SHA256 digest of the SPKI of the first private key in "pkey.pem" +$ openssl pkey -in pkey.pem -pubout -outform DER | + openssl dgst -sha256 -c +</pre> + +<p> This feature is available in Postfix 3.9 and later. </p> + +%PARAM lmtp_tls_enable_rpk yes + +<p> The LMTP-specific version of the smtp_tls_enable_rpk +configuration parameter. See there for details. </p> + +<p> This feature is available in Postfix 3.9 and later. </p> + %PARAM use_srv_lookup <p> Enables discovery for the specified service(s) using DNS SRV @@ -18629,8 +19001,7 @@ via the tls_config_file parameter. When empty, or when the selected name is not present in the configuration file, the default application name ("openssl_conf") is used as a fallback. </p> -<p> This feature is available in Postfix ≥ 3.9, 3.8.1, 3.7.6, -3.6.10, and 3.5.20. </p> +<p> This feature is available in Postfix ≥ 3.9. </p> %PARAM tls_config_file default @@ -18719,7 +19090,7 @@ MinProtocol = TLSv1 <p> This feature is available in Postfix ≥ 3.9, 3.8.1, 3.7.6, 3.6.10, and 3.5.20. </p> -%PARAM smtpd_forbid_bare_newline Postfix < 3.9: no +%PARAM smtpd_forbid_bare_newline Postfix ≥ 3.9: normalize <p> Reject or restrict input lines from an SMTP client that end in <LF> instead of the standard <CR><LF>. Such line @@ -18732,7 +19103,8 @@ SMTP smuggling</a>. </p> <dl compact> -<dt> <b>normalize</b></dt> <dd> Require the standard +<dt> <b>normalize</b> (default for Postfix ≥ 3.9) </dt> +<dd> Require the standard End-of-DATA sequence <CR><LF>.<CR><LF>. Otherwise, allow command or message content lines ending in the non-standard <LF>, and process them as if the client sent the @@ -18744,6 +19116,13 @@ with the standard End-of-DATA sequence <CR><LF>.<CR><LF>. <br> <br> Such clients can be excluded with smtpd_forbid_bare_newline_exclusions. </dd> +<dt> <b>note</b> </dt> <dd> Same as "normalize", but also notes in +the log whether the Postfix SMTP server received any lines with +"bare <LF>". The information is formatted as "<tt>disconnect +from name[address] ... notes=bare_lf</tt>". The notes value is +expected to become a list of comma-separated names. <br> <br> This +feature is available in Postfix 3.9 and later. </dd> + <dt> <b>yes</b> </dt> <dd> Compatibility alias for <b>normalize</b>. </dd> <dt> <b>reject</b> </dt> <dd> Require the standard End-of-DATA @@ -18762,8 +19141,8 @@ of BDAT violations, BDAT can be selectively disabled with smtpd_discard_ehlo_keyword_address_maps, or globally disabled with smtpd_discard_ehlo_keywords). </dd> -<dt> <b>no</b> (default)</dt> <dd> Do not require the standard -End-of-DATA +<dt> <b>no</b> (default for Postfix < 3.9) </dt> +<dd> Do not require the standard End-of-DATA sequence <CR><LF>.<CR><LF>. Always process a bare <LF> as if the client sent <CR><LF>. This option is fully backwards compatible, but is not recommended for @@ -18889,9 +19268,24 @@ implementation-dependent manner. </p> <p> Disconnect remote SMTP clients that violate RFC 2920 (or 5321) command pipelining constraints. The server replies with "554 5.5.0 Error: SMTP protocol synchronization" and logs the unexpected remote -SMTP client input. Specify "smtpd_forbid_unauth_pipelining = yes" -to enable. This feature is enabled by default with Postfix ≥ -3.9. </p> +SMTP client input. This feature is enabled by default with Postfix +≥ 3.9. Specify "smtpd_forbid_unauth_pipelining = no" to disable. +</p> <p> This feature is available in Postfix ≥ 3.9, 3.8.1, 3.7.6, 3.6.10, and 3.5.20. </p> + +%PARAM force_mime_input_conversion no + +<p> Convert body content that claims to be 8-bit into quoted-printable, +before header_checks, body_checks, Milters, and before after-queue +content filters. This feature does not affect messages that are +sent into smtpd_proxy_filter. </p> + +<p> The typical use case is an MTA that applies this conversion +before signing outbound messages, so that the signatures will remain +valid when a message is later delivered to an MTA that does not +announce 8BITMIME support, or when a message line exceeds the SMTP +length limit. </p> + +<p> This feature is available in Postfix ≥ 3.9. </p> |