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| -rw-r--r-- | RELEASE_NOTES-2.11 | 280 |
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diff --git a/RELEASE_NOTES-2.11 b/RELEASE_NOTES-2.11 new file mode 100644 index 0000000..2cf3939 --- /dev/null +++ b/RELEASE_NOTES-2.11 @@ -0,0 +1,280 @@ +The stable Postfix release is called postfix-2.11.x where 2=major +release number, 11=minor release number, x=patchlevel. The stable +release never changes except for patches that address bugs or +emergencies. Patches change the patchlevel and the release date. + +New features are developed in snapshot releases. These are called +postfix-2.12-yyyymmdd where yyyymmdd is the release date (yyyy=year, +mm=month, dd=day). Patches are never issued for snapshot releases; +instead, a new snapshot is released. + +The mail_release_date configuration parameter (format: yyyymmdd) +specifies the release date of a stable release or snapshot release. + +If you upgrade from Postfix 2.9 or earlier, read RELEASE_NOTES-2.10 +before proceeding. + +Major changes - tls +------------------- + +[Documentation 20131218] The new FORWARD_SECRECY_README document +conveniently presents all information about Postfix "perfect" forward +secrecy support in one place: what forward secrecy is, how to tweak +settings, and what you can expect to see when Postfix uses ciphers +with forward secrecy. + +[Feature 20130602] Support for PKI-less TLS server certificate +verification, where the CA public key or the server certificate is +identified via DNSSEC lookup. + +This feature introduces new TLS security levels called "dane" and +"dane-only" (DNS-based Authentication of Named Entities) that use +DNSSEC to look up CA or server certificate information. The details +of DANE core protocols are still evolving, as are the details of +how DANE should be used in the context of SMTP. Postfix implements +what appears to be a "rational" subset of the DANE profiles that +is suitable for SMTP. + +The problem with conventional PKI is that there are literally +hundreds of organizations world-wide that can provide a certificate +in anyone's name. There have been widely-published incidents in +recent history where a certificate authority gave out an inappropriate +certificate (e.g., a certificate in the name of Microsoft to someone +who did not represent Microsoft), where a CA was compromised (e.g., +DigiNotar, Comodo), or where a CA made operational mistakes (e.g., +TURKTRUST). Another concern is that a legitimate CA might be coerced +to provide a certificate that allows its government to play +man-in-the-middle on TLS traffic and observe the plaintext. + +Major changes - LMDB database support +------------------------------------- + +LMDB is a memory-mapped database that was originally developed as +part of OpenLDAP. The Postfix LMDB driver was originally contributed +by Howard Chu, LMDB's creator. + +LMDB can be used for all Postfix lookup tables and caches. It is +the first persistent Postfix database that can be shared among +multiple writers such as postscreen daemons (Postfix already supported +shared non-persistent memcached caches). See lmdb_table(5) and +LMDB_README for further information, including how to access Postfix +LMDB databases with non-Postfix programs. + +Postfix currently requires LMDB version 0.9.11 or later. The minimum +version may change over time in the light of deployment experience. + +Major changes - postscreen whitelisting +--------------------------------------- + +[Feature 20130512] Allow a remote SMTP client to skip postscreen(8) +tests based on its postscreen_dnsbl_sites score. + +Specify a negative "postscreen_dnsbl_whitelist_threshold" value to +enable this feature. When a client passes the threshold value +without having failed other tests, all pending or disabled tests +are flagged as completed. + +This feature can mitigate the email delays due to "after 220 greeting" +protocol tests, which otherwise require that a client reconnects +before it can deliver mail. Some providers such as Google don't +retry from the same IP address. This can result in large email +delivery delays. + +Major changes - recipient_delimiter +----------------------------------- + +[Feature 20130405] The recipient_delimiter parameter can now specify +a set of characters. A user name is now separated from its address +extension by the first character that matches the recipient_delimiter +set. + +For example, specify "recipient_delimiter = +-" to support both the +Postfix-style "+" and the qmail-style "-" extension delimiter. + +As before, this implementation recognizes one delimiter character +per email address, and one address extension per email address. + +Major changes - smtpd access control +------------------------------------ + +[Feature 20131031] The check_sasl_access feature can be used to +block hijacked logins. Like other check_mumble_access features it +queries a lookup table (in this case with the SASL login name), and +it supports the same actions as any Postfix access(5) table. + +[Feature 20130924] The reject_known_sender_login_mismatch feature +applies reject_sender_login_mismatch only to MAIL FROM addresses +that are known in $smtpd_sender_login_maps. + +Major changes - MacOS X +----------------------- + +[Feature 20130325] Full support for kqueue() event handling which +scales better with large numbers of file handles, plus a workaround +for timeout handling on file handles (such as /dev/urandom) that +still do not correctly support poll(). + +Major changes - master +---------------------- + +[Incompat 20131217] The master_service_disable parameter value +syntax has changed: use "service/type" instead of "service.type". +The new form is consistent with postconf(1) namespaces for master.cf. +The old form is still supported to avoid breaking existing +configurations. + +Major changes - milter +---------------------- + +[Feature 20131126] Support for ESMTP parameters "NOTIFY" and "ORCPT" +in the SMFIR_ADDRCPT_PAR (add recipient with parameters) request. +Credits: Andrew Ayer. + +Major changes - mysql +--------------------- + +[Feature 20131117] MySQL client support for option_file, option_group, +tls_cert_file, tls_key_file, tls_CAfile, tls_CApath, tls_verify_cert. +Credits: Gareth Palmer. + +Major changes - postconf +------------------------ + +[Feature 20131217] Support for advanced master.cf query and update +operations. This was implemented primarily to support automated +system management tools. + +The goal is to make all Postfix master.cf details accessible as +lists of "name=value" pairs, where the names are organized into +structured name spaces. This allows other programs to query +information or request updates, without having to worry about the +exact layout of master.cf files. + +Managing master.cf service attributes +------------------------------------- + +First, an example that shows the smtp/inet service in the traditional +form: + + $ postconf -M smtp/inet + smtp inet n - n - - smtpd + +Different variants of this command show different amounts of output. +For example, "postconf -M smtp" enumerates all services that have +a name "smtp" and any service type ("inet", "unix", etc.), and +"postconf -M" enumerates all master.cf services. + +General rule: each name component that is not present becomes a "*" +wildcard. + +Coming back to the above example, the postconf -F option can now +enumerate the smtp/inet service fields as follows: + + $ postconf -F smtp/inet + smtp/inet/service = smtp + smtp/inet/type = inet + smtp/inet/private = n + smtp/inet/unprivileged = - + smtp/inet/chroot = n + smtp/inet/wakeup = - + smtp/inet/process_limit = - + smtp/inet/command = smtpd + +This form makes it very easy to change one field in master.cf. +For example to turn on chroot on the smtp/inet service you use: + + $ postconf -F smtp/inet/chroot=y + $ postfix reload + +Moreover, with "-F" you can specify "*" for service name or service +type to get a wild-card match. For example, to turn off chroot on +all Postfix daemons, use this: + + $ postconf -F '*/*/chroot=n' + $ postfix reload + +Managing master.cf service "-o parameter=value" settings +-------------------------------------------------------- + +For a second example, let's look at the submission service. This +service typically has multiple "-o parameter=value" overrides. First +the traditional view: + + $ postconf -Mf submission + submission inet n - n - - smtpd + -o smtpd_tls_security_level=encrypt + -o smtpd_sasl_auth_enable=yes + ... + +The postconf -P option can now enumerate these parameters as follows: + + $ postconf -P submission + submission/inet/smtpd_sasl_auth_enable = yes + submission/inet/smtpd_tls_security_level = encrypt + ... + +Again, this form makes it very easy to modify one parameter +setting. For example, to change the smtpd_tls_security_level setting +for the submission/inet service: + + $ postconf -P 'submission/inet/smtpd_tls_security_level=may' + +You can create or remove a parametername=parametervalue setting: + +Create: + $ postconf -P 'submission/inet/parametername=parametervalue' + +Remove: + $ postconf -PX submission/inet/parametername + +Finally, always execute "postfix reload" after updating master.cf. + +Managing master.cf service entries +---------------------------------- + +Finally, adding master.cf entries is possible, but currently this +does not yet have "advanced" support. It can only be done at the +level of the traditional master.cf file format. + +Suppose that you need to configure a Postfix SMTP client that will +handle slow email deliveries. To implement this you need to clone +the smtp/unix service settings and create a new delay/unix service. + +First, you would enumerate the smtp/unix service like this: + + $ postconf -M smtp/unix + smtp unix - - n - - smtp + +Then you would copy those fields (except the first field) by hand +to create the delay/unix service: + + $ postconf -M delay/unix="delay unix - - n - - smtp" + +To combine the above steps in one command: + + $ postconf -M delay/unix="`postconf -M smtp/unix|awk '{$1 = "delay"}'`" + +This is perhaps not super-convenient for manual cloning, but it +should be sufficient for programmatic configuration management. + +Again, always execute "postfix reload" after updating master.cf. + +Deleting or commenting out master.cf entries +-------------------------------------------- + +The -X (delete entry) and -# (comment out entry) options already +exist for main.cf, and they now also work work for entire master.cf +entries: + +Remove main.cf or master.cf entry: + $ postconf -X parametername + $ postconf -MX delay/unix + +Comment out main.cf or master.cf entry: + $ postconf -# parametername + $ postconf -M# delay/unix + +As with main.cf, there is no support to "undo" master.cf changes +that are made with -X or -#. + +Again, always execute "postfix reload" after updating master.cf. |