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1 000 000 messages with good performance unlikely above that limit
10 10 Mandatory configuration file edits
11 11 To chroot or not to chroot
12 12 Care and feeding of the Postfix system
14 rbl_domain rbl_reason rbl_reason
168 100 189 2 255 255 255 224
18 rbl_domain rbl_reason rbl_reason
1 ffff ffff ffff ffff ffff ffff ffff ffff
2001 240 587 0 2d0 b7ff fe88 2ca7 ffff ffff ffff ffff
31 sasldb Accounts are stored stored in a Cyrus SASL Berkeley DB
33 ldapdb Accounts are stored stored in an LDAP database
4 yes yes yes never 100
5 postmaster postmaster example com
5 root root localhost
6 abuse abuse example com
80821 S 0 00 24 smtpd n smtp t inet u c o stress yes
83326 S 0 00 28 smtpd n smtp t inet u c o stress
84345 Ss 0 00 11 usr bin perl usr libexec postfix smtpd policy pl
8 SENDMAIL usr sbin sendmail G i NEVER NEVER NEVER use t here
address localpart as per RFC 822 so that additional or or
all all Maximum per destination delivery concurrency
and cost cost 1 times more than if the preemptive scheduler was
and sneak in the ten recipient mail Wait wait wait Could we Aren t
aNULL aNULL kEECDH kEDH RC4 eNULL EXPORT LOW STRENGTH
Arrival Date Sun 26 Nov 2006 17 01 01 0500 EST
attacks with user domain domain addresses when Postfix provides
authzTo authzTo dn regex uniqueIdentifier ou people dc example dc com
AUXLIBS AUXLIBS options for LDAP or TLS etc
blockquote blockquote
broken smtp smtp o smtp_quote_rfc821_envelope no
ccert_fingerprint C2 9D F4 87 71 73 73 D9 18 E7 C2 F3 C1 DA 6E 04
command_directory command_directory
concurrency concurrency limit
config_directory config_directory
daemon_directory daemon_directory
data_directory data_directory
Date Sun 26 Nov 2006 17 01 01 0500 EST
dd dd Alternatively check_ccert_access accepts an explicit search
dd dd check_ccert_access type table search_order cert_fingerprint
dd dd The commas are optional dd
dd dd The default algorithm is b sha256 b with Postfix ge 3 6
dd No TLS TLS will not be used unless enabled for specific
Dec 4 04 30 09 hostname postfix smtpd 58549 NOQUEUE reject
default_transport uucp uucp gateway
different client IP addresses Lookup results override the the global
Documentation Documentation is available as README files start with the file
done done
done done
dt b a name check_address_map check_address_map a i a href DATABASE_RE
dt b a name check_ccert_access check_ccert_access a i a href DATABASE_
dt b a name check_client_a_access check_client_a_access a i a href DAT
dt b a name check_client_access check_client_access a i a href DATABAS
dt b a name check_client_mx_access check_client_mx_access a i a href D
dt b a name check_client_ns_access check_client_ns_access a i a href D
dt b a name check_etrn_access check_etrn_access a i a href DATABASE_RE
dt b a name check_helo_a_access check_helo_a_access a i a href DATABAS
dt b a name check_helo_access check_helo_access a i a href DATABASE_RE
dt b a name check_helo_mx_access check_helo_mx_access a i a href DATAB
dt b a name check_helo_ns_access check_helo_ns_access a i a href DATAB
dt b a name check_policy_service check_policy_service i servername i a
dt b a name check_recipient_a_access check_recipient_a_access a i a hre
dt b a name check_recipient_access check_recipient_access a i a href D
dt b a name check_recipient_mx_access check_recipient_mx_access a i a h
dt b a name check_recipient_ns_access check_recipient_ns_access a i a h
dt b a name check_sasl_access check_sasl_access a i a href DATABASE_RE
dt b a name check_sender_a_access check_sender_a_access a i a href DAT
dt b a name check_sender_access check_sender_access a i a href DATABAS
dt b a name check_sender_mx_access check_sender_mx_access a i a href D
dt b a name check_sender_ns_access check_sender_ns_access a i a href D
dt b a name defer defer a b dt
dt b a name defer_if_permit defer_if_permit a b dt
dt b a name defer_if_reject defer_if_reject a b dt
dt b a name defer_unauth_destination defer_unauth_destination a b dt
dt b a name no_address_mappings no_address_mappings a b dt
dt b a name no_header_body_checks no_header_body_checks a b dt
dt b a name no_milters no_milters a b dt
dt b a name no_unknown_recipient_checks no_unknown_recipient_checks a b
dt b a name permit_auth_destination permit_auth_destination a b dt
dt b a name permit_dnswl_client permit_dnswl_client i dnswl_domain d d d d
dt b a name permit_inet_interfaces permit_inet_interfaces a b dt
dt b a name permit_mx_backup permit_mx_backup a b dt
dt b a name permit_mynetworks permit_mynetworks a b dt
dt b a name permit permit a b dt
dt b a name permit_rhswl_client permit_rhswl_client i rhswl_domain d d d d
dt b a name permit_sasl_authenticated permit_sasl_authenticated a b dt
dt b a name permit_tls_all_clientcerts permit_tls_all_clientcerts a b
dt b a name permit_tls_clientcerts permit_tls_clientcerts a b dt
dt b a name reject_invalid_helo_hostname reject_invalid_helo_hostname a
dt b a name reject_multi_recipient_bounce reject_multi_recipient_bounce a
dt b a name reject_non_fqdn_helo_hostname reject_non_fqdn_helo_hostname a
dt b a name reject_non_fqdn_recipient reject_non_fqdn_recipient a b dt
dt b a name reject_non_fqdn_sender reject_non_fqdn_sender a b dt
dt b a name reject_plaintext_session reject_plaintext_session a b dt
dt b a name reject_rbl_client reject_rbl_client i rbl_domain d d d d i
dt b a name reject reject a b dt
dt b a name reject_rhsbl_client reject_rhsbl_client i rbl_domain d d d d
dt b a name reject_rhsbl_helo reject_rhsbl_helo i rbl_domain d d d d i
dt b a name reject_rhsbl_recipient reject_rhsbl_recipient i rbl_domain d d
dt b a name reject_rhsbl_reverse_client reject_rhsbl_reverse_client i rbl_
dt b a name reject_rhsbl_sender reject_rhsbl_sender i rbl_domain d d d d
dt b a name reject_sender_login_mismatch reject_sender_login_mismatch a
dt b a name reject_unauth_destination reject_unauth_destination a b dt
dt b a name reject_unauth_pipelining reject_unauth_pipelining a b dt
dt b a name reject_unknown_client_hostname reject_unknown_client_hostname
dt b a name reject_unknown_helo_hostname reject_unknown_helo_hostname a
dt b a name reject_unknown_recipient_domain reject_unknown_recipient_domain
dt b a name reject_unknown_sender_domain reject_unknown_sender_domain a
dt b a name reject_unlisted_recipient reject_unlisted_recipient a b wi
dt b a name reject_unlisted_sender reject_unlisted_sender a b dt
dt b a name reject_unverified_recipient reject_unverified_recipient a b
dt b a name reject_unverified_sender reject_unverified_sender a b dt
dt b a name sleep sleep i seconds i a b dt
dt b a name warn_if_reject warn_if_reject a b dt
dt dt b i a href DATABASE_README html type table a i b dt
dt dt b i number i i number i b dt
dt dt dd 0 Disable logging of TLS activity dd
dt dt dd 1 Log only a summary message on TLS handshake completion
dt dt dd 2 Also log levels during TLS negotiation dd
dt dt dd 3 Also log hexadecimal and ASCII dump of TLS negotiation
dt dt dd 4 Also log hexadecimal and ASCII dump of complete
dude dude example com
eliminates the latency of the TCP handshake SYN SYN ACK ACK
example com uucp uucp host
example MAIL RCPT BDAT BDAT MAIL RCPT BDAT without ever having to
export MANPATH MANPATH pwd man MANPATH
fe80 1 2d0 b7ff fe88 2ca7 ffff ffff ffff ffff
fe80 5 1 ffff ffff ffff ffff
file allows for robust handling of temporary delivery errors errors
Filtered Filtered
for the file name when a pattern is a type table table specification
from host example com 192 168 0 2 TLSv1 with cipher cipher name
generic generic a restrictions These restrictions are applicable in
groups msn com 63 2 1 2 4 4 14 14 14 8 0
highvolume com 4000 160 160 320 640 1280 1440 0 0 0 0
host host port host port address or address port the form
http www umich edu dirsvcs ldap ldap html or OpenLDAP
id 84863BC0E5 Sun 26 Nov 2006 17 01 01 0500 EST
if concurrency concurrency limit
ifconfig en0 alias address netmask 255 255 255 255
inet_addr_local inet_addr_local configured 2 IPv4 addresses
inet_addr_local inet_addr_local configured 4 IPv6 addresses
insiders_only insiders_only check_sender_access hash etc postfix insiders reject
in the form of a domain name hostname hostname port hostname port
into memory such as pcre regexp or texthash texthash is similar
jane jane janes preferred machine
joe joe joes preferred machine
Line 8 NEVER NEVER NEVER use the t command line option here It
listname listname request
lists sourceforge net 2313 2313 0 0 0 0 0 0 0 0
local local 8
local_only local_only
maildrop maildrop
maildrop maildrop owner cn root dc your dc com
make make makefiles CC opt ansic bin cc Ae HP UX
make make makefiles CC purify cc
man man man5 postconf 5 less
master_service_disable foo inet inet
multi_instance_enable multi_instance_enable
multi_instance_group multi_instance_group
multi_instance_name multi_instance_name
mydestination myhostname localhost mydomain mydomain
mydomain to an incomplete address address rewriting alias
mynetworks mynetworks 127 0 0 0 8 168 100 189 0 28 1 128 fe80 10 2001 240 587
mynetworks mynetworks hash etc postfix network_table
Name lt user example com gt gt i Postfix will ignore the i User
name name port name or name port
NOTE Postfix 3 6 also introduces support for the level level
number number ranges Postfix version 2 8 and later If no
numbers or number number ranges Postfix version 2 8 and later
one or more separated numbers or number number ranges
openssl req new key key
or more separated numbers or number number ranges p
or number number ranges Postfix version 2 8 and later If no
ownership of system directories such as etc usr usr bin var
PARAM postscreen_dnsbl_max_ttl postscreen_dnsbl_ttl postscreen_dnsbl_ttl
patterns list multiple domain names as domain domain
p Note 2 address information may be enclosed inside tt tt
postfix 12345 12345 postfix no where no shell
Postfix 2 3 2 5 to hang up on clients that that match
Postfix has TWO sets of mail filters filters that are used for
Postfix Postfix can use an LDAP directory as a source for any of its lookups
Postfix Postfix passes the status back to the remote SMTP
Postfix Postfix will send the mail back to the sender address
pre pre
query_filter mailacceptinggeneralid s maildrop maildrop
queue_directory queue_directory
Received from localhost localhost 127 0 0 1
Received Received from porcupine org
rejected rejected recipients are available on request by the Milter
rewrite 8 none none
Say we have ten recipient mail followed by two two recipient mails If
separated numbers or number number ranges If no
smtpd_recipient_restrictions smtpd_recipient_restrictions
smtpd_relay_restrictions smtpd_relay_restrictions
smtpd_relay_restrictions smtpd_relay_restrictions
smtpd_tls_mandatory_protocols SSLv2 SSLv3 TLSv1 TLSv1 1
smtpd_tls_mandatory_protocols SSLv2 SSLv3 TLSv1 TLSv1 1
smtp smtp o smtp_bind_address 11 22 33 44
smtp smtp o smtp_bind_address6 1 2 3 4 5 6 7 8
smtp_tls_mandatory_protocols SSLv2 SSLv3 TLSv1 TLSv1 1
smtp_tls_mandatory_protocols SSLv2 SSLv3 TLSv1 TLSv1 1
SSLv3 TLSv1 TLSv1 1 TLSv1 2 and TLSv1 3 Starting with
T 5 10 20 40 80 160 320 640 1280 1280
T A 5 10 20 40 80 160 320 320
The and match and literally Without the the
The matches literally Without the the would
Therefore 301 0301 0x301 and 0x0301 are all equivalent to
The syntax of name value value name value and name value
the the backed up domain tld domain This prevents your mail queue
tls_random_source dev dev urandom
tls_random_source dev dev urandom
tls_random_source dev dev urandom
TLS TLS support in the LMTP delivery agent
TLSv1 3 with cipher TLS_AES_256_GCM_SHA384 256 256 bits
to flush flush 8 Deferred
to host example com 192 168 0 2 25 TLSv1 with cipher cipher name
to server example TLSv1 3 with cipher TLS_AES_256_GCM_SHA384 256 256 bits
TOTAL 5000 200 200 400 800 1600 1000 200 200 200 200
transport transport
tt tt in the authorized_verp_clients value and in files
tt tt in the mynetworks value and in files specified with
tt tt in the smtpd_authorized_verp_clients value and in
tt tt in the smtpd_authorized_xclient_hosts value and in
tt tt in the smtpd_authorized_xforward_hosts value and in
tt tt in the smtpd_client_event_limit_exceptions value and
tt tt in the smtpd_sasl_exceptions_networks value and in
tt tt p
two two recipient mails
uid cn cn auth
Unfiltered Unfiltered
unknown recipients in local domains domains that match mydestination
Use blockquote pre pre blockquote for examples
Use pre pre for the Examples section at the end
username username
user sourceforge net 7678 7678 0 0 0 0 0 0 0 0
using TLSv1 3 with cipher TLS_AES_256_GCM_SHA384 256 256 bits
using TLSv1 with cipher cipher name
var var spool and so on This is especially an issue if you executed
With the standard operators lt lt etc compatibility
yes yes yes never 100
zombie zombie tlsproxy 8 smtpd 8
and 1 000 000 messages with good performance unlikely above that
dt dt b name value b Postfix ge 3 0 dt
dt dt dd 3 Also log the hexadecimal and ASCII dump of the
dt dt dd 4 Also log the hexadecimal and ASCII dump of complete
parametername stress something something Other
p Note on OpenBSD systems specify dev dev arandom when dev dev urandom
user3 example net smtp smtp relay example net submission
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