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文件: /usr/share/doc/postfix-3.4.7/README_FILES/RELEASE_NOTES
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This is the Postfix 3.4 (stable) release. The stable Postfix release is called postfix-3.4.x where 3=major release number, 4=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-3.5-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 3.2 or earlier, read RELEASE_NOTES-3.3 before proceeding. TLS Workaround for Postfix 3.4.6, 3.3.5, 3.2.10 and 3.1.13 ----------------------------------------------------------- This release introduces a workaround for implementations that hang Postfix while shutting down a TLS session, until Postfix times out. With "tls_fast_shutdown_enable = yes" (the default), Postfix no longer waits for a remote TLS peer to respond to a TLS 'close' request. This behavior is recommended with TLSv1.0 and later. Specify "tls_fast_shutdown_enable = no" to get historical Postfix behavior. License change --------------- This software is distributed with a dual license: in addition to the historical IBM Public License 1.0, it is now also distributed with the more recent Eclipse Public License 2.0. Recipients can choose to take the software under the license of their choice. Those who are more comfortable with the IPL can continue with that license. Summary of changes ------------------ Incompatible changes, bdat support, containers, database support, logging, safety, tls connection pooling, tls support, usability, Incompatible changes -------------------- [Incompat 20180826] The Postfix SMTP server announces CHUNKING (BDAT command) by default. In the unlikely case that this breaks some important remote SMTP client, disable the feature as follows: /etc/postfix/main.cf: # The logging alternative: smtpd_discard_ehlo_keywords = chunking # The non-logging alternative: smtpd_discard_ehlo_keywords = chunking, silent_discard See BDAT_README for more. [Incompat 20190126] This introduces a new master.cf service 'postlog' with type 'unix-dgram' that is used by the new postlogd(8) daemon. Before backing out to an older Postfix version, edit the master.cf file and remove the postlog entry. [Incompat 20190106] Postfix 3.4 drops support for OpenSSL 1.0.1 (end-of-life was December 31, 2016) and all earlier releases. [Incompat 20180701] To avoid performance loss under load, the tlsproxy(8) daemon now requires a zero process limit in master.cf (this setting is provided with the default master.cf file). By default, a tlsproxy(8) process will retire after several hours. To set the tlsproxy process limit to zero: # postconf -F tlsproxy/unix/process_limit=0 # postfix reload Major changes - bdat support -------------------- [Feature 20180826] Postfix SMTP server support for RFC 3030 CHUNKING (the BDAT command) without BINARYMIME, in both smtpd(8) and postscreen(8). This has no effect on Milters, smtpd_mumble_restrictions, and smtpd_proxy_filter. See BDAT_README for more. Major changes - containers -------------------------- [Feature 20190126] Support for logging to file or stdout, instead of using syslog. - Logging to file solves a usability problem for MacOS, and eliminates multiple problems with systemd-based systems. - Logging to stdout is useful when Postfix runs in a container, as it eliminates a syslogd dependency. See MAILLOG_README for configuration examples and logfile rotation. [Feature 20180422] Better handling of undocumented(!) Linux behavior whether or not signals are delivered to a PID=1 process. Major changes - database support -------------------------------- [Feature 20181105] Support for (key, list of filenames) in map source text. - Currently, this feature is used only by tls_server_sni_maps. - When a map is created from source with "postmap -F maptype:mapname", the command processes each key as usual and processes each value as a list of filenames, concatenates the content of those files (with one newline character in-between files), and stores an entry with (key, base64-encoded result). - When a map is queried with "postmap -F -q ...", the command base64-decodes each value. It reports an error when a value is not in base64 form. This "postmap -F -q ..." behavior also works when querying the memory-resident map types cidr:, inline:, pcre:, randmap:, regexp:, and static:. Postfix reads the files specified as table values, stores base64-encoded content, and base64-decodes content upon table lookup. Internally, Postfix will turn on this behavior for lookups (not updates) when a map is opened with the DICT_FLAG_RHS_IS_FILE flag. Major changes - logging ----------------------- [Feature 20190126] Support for logging to file or stdout, instead of using syslog. - Logging to file solves a usability problem for MacOS, and eliminates multiple problems with systemd-based systems. - Logging to stdout is useful when Postfix runs in a container, as it eliminates a syslogd dependency. See MAILLOG_README for configuration examples and logfile rotation. Major changes - safety ---------------------- [Feature 20180623] Automatic retirement: dnsblog(8) and tlsproxy(8) process will now voluntarily retire after after max_idle*max_use, or some sane limit if either limit is disabled. Without this, a process could stay busy for days or more. Major changes - tls connection pooling -------------------------------------- [Feature 20180617] Postfix SMTP client support for multiple deliveries per TLS-encrypted connection. This is primarily to improve mail delivery performance for destinations that throttle clients when they don't combine deliveries. This feature is enabled with "smtp_tls_connection_reuse=yes" in main.cf, or with "tls_connection_reuse=yes" in smtp_tls_policy_maps. It supports all Postfix TLS security levels including dane and dane-only. The implementation of TLS connection reuse relies on the same scache(8) service as used for delivering plaintext SMTP mail, the same tlsproxy(8) daemon as used by the postscreen(8) service for inbound connections, and relies on the same hints from the qmgr(8) daemon. It reuses the configuration parameters described in CONNECTION_CACHE_README. The Postfix SMTP client now logs whether an SMTP-over-TLS connection is newly established ("TLS connection established") or whether the connection is reused ("TLS connection reused"). The following illustrates how TLS connections are reused: Initial plaintext SMTP handshake: smtp(8) -> remote SMTP server Reused SMTP/TLS connection, or new SMTP/TLS connection: smtp(8) -> tlsproxy(8) -> remote SMTP server Cached SMTP/TLS connection: scache(8) -> tlsproxy(8) -> remote SMTP server Major changes - tls support --------------------------- [Feature 20190106] SNI support in the Postfix SMTP server, the Postfix SMTP client, and in the tlsproxy(8) daemon (both server and client roles). See the postconf(5) documentation for the new tls_server_sni_maps and smtp_tls_servername parameters. [Feature 20190106] Support for files that contain multiple (key, certificate, trust chain) instances. This was required to implement server-side SNI table lookups, but it also eliminates the need for separate cert/key files for RSA, DSA, Elliptic Curve, and so on. The file format is documented in the TLS_README sections "Server-side certificate and private key configuration" and "Client-side certificate and private key configuration", and in the postconf(5) documentation for the parameters smtp_tls_chain_files, smtpd_tls_chain_files, tlsproxy_client_chain_files, and tlsproxy_tls_chain_files. Note: the command "postfix tls" does not yet support the new consolidated certificate chain format. If you switch to the new format, you'll need to manage your keys and certificates directly, rather than via postfix-tls(1). Major changes - usability ------------------------- [Feature 20180812] Support for smtpd_reject_footer_maps (as well as the postscreen variant postscreen_reject_footer_maps) for more informative reject messages. This is indexed with the Postfix SMTP server response text, and overrides the footer specified with smtpd_reject_footer. One will want to use a pcre: or regexp: map with this.
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