[An on-line version of this announcement will be available at
https://www.postfix.org/announcements/postfix-3.9.0.html]
Postfix stable release 3.9.0 is available. Postfix 3.5 - 3.8 were
updated earlier this week; after that, Postfix 3.5 will no longer
be updated.
The main changes are below. See the RELEASE_NOTES file for further
details.
Removed functionality:
* As described in DEPRECATION_README, the SMTP server features
"permit_naked_ip_address", "check_relay_domains", and
"reject_maps_rbl" have been removed, after they have been logging
a warning for some 20 years. These features now log a warning
and return a "server configuration error" response.
* The MySQL client no longer supports MySQL versions < 4.0. MySQL
version 4.0 was released in 2003.
Officially obsolete functionality:
* As covered in DEPRECATION_README, the configuration parameter
"disable_dns_lookup" and about a dozen TLS-related parameters
are now officially obsolete. These parameters still work, but
the postconf command logs warnings that they will be removed
from Postfix.
* As covered in DEPRECATION_README, "permit_mx_backup" logs a
warning that it will be removed from Postfix.
Changed functionality:
* In message headers, Postfix now formats numerical days as
two-digit days, i.e. days 1-9 have a leading zero instead of a
leading space. This change was made because the RFC 5322 date
and time specification recommends (i.e. SHOULD) that a single
space be used in each place that folding white space appears.
This change avoids a breaking change in the length of a date
string.
* The MySQL client default characterset is now configurable with
the "charset" configuration file attribute. The default is
"utf8mb4", consistent with the MySQL 8.0 built-in default, but
different from earlier MySQL versions where the built-in default
was "latin1".
New functionality:
* Support to query MongoDB databases, contributed by Hamid Maadani,
based on earlier code by Stephan Ferraro. See MONGODB_README
and mongodb_table(5)
* The RFC 3461 envelope ID is now exported in the local(8) delivery
agent with the ENVID environment variable, and in the pipe(8)
delivery agent with the ${envid} command-line attribute.
* Configurable idle and retry timer settings in the mysql: and
pgsql: clients. A shorter than default retry timer can sped up
the recovery after error, when Postfix is configured with only
one server in the "hosts" attribute. After the code was frozen
for release, we have learned that Postfix can recover faster
from some errors when the single server is specified multiple
times in the "hosts" attribute.
* Optional Postfix TLS support to request an RFC7250 raw public
key instead of an X.509 public-key certificate. The configuration
settings for raw key public support will be ignored when there
is no raw public key support in the local TLS implementation
(i.e. Postfix with OpenSSL versions before 3.2). See RELEASE_NOTES
for more information.
* Preliminary support for OpenSSL configuration files, primarily
OpenSSL 1.1.1b and later. This introduces two new parameters
"tls_config_file" and "tls_config_name", which can be used to
limit collateral damage from OS distributions that crank up
security to 11, increasing the number of plaintext email
deliveries. Details are in the postconf(5) manpage under
"tls_config_file" and "tls_config_name".
Attack resistance:
* With "smtpd_forbid_unauth_pipelining = yes" (the default),
Postfix defends against multiple "blind" SMTP attacks. This
feature was back-ported to older stable releases but disabled
by default.
* With "smtpd_forbid_bare_newline = normalize" (the default)
Postfix defends against SMTP smuggling attacks. See RELEASE_NOTES
for details. This feature was back-ported to older stable
releases but disabled by default.
* Prevent outbound SMTP smuggling, where an attacker uses Postfix
to send email containing a non-standard End-of-DATA sequence,
to exploit inbound SMTP smuggling at a vulnerable remote SMTP
server. With "cleanup_replace_stray_cr_lf = yes" (the default),
the cleanup daemon replaces each stray <CR> or <LF> character
in message content with a space character. This feature was
back-ported to older stable releases with identical functionality.
* The Postfix DNS client now limits the total size of DNS lookup
results to 100 records; it drops the excess records, and logs
a warning. This limit is 20x larger than the number of server
addresses that the Postfix SMTP client is willing to consider
when delivering mail, and is far below the number of records
that could cause a tail recursion crash in dns_rr_append() as
reported by Toshifumi Sakaguchi. This also introduces a similar
limit on the number of DNS requests that a check_*_*_access
restriction can make. All this was back-ported to older stable
releases with identical functionality.
You can find the Postfix source code at the mirrors listed at
https://www.postfix.org/.
Wietse
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