- Improved before-queue content filter performance. With
"smtpd_proxy_options = speed_adjust", the Postfix SMTP server
receives the entire message before it connects to a before-queue
content filter. Typically, this allows Postfix to handle the same
mail load with fewer content filter processes.
- Improved address verification performance. The verify database is now
persistent by default, and it is automatically cleaned periodically. Under
overload conditions, the Postfix SMTP server no longer waits up to 6 seconds
for an address probe to complete.
- Support for reputation management based on the local SMTP client IP address.
This is typically implemented with "FILTER transportname:" actions in access
maps or header/body checks, and mail delivery transports in master.cf with
unique smtp_bind_address values.
- "postmulti -p command" did not skip disabled instances.
- In the multi_instance_wrapper parameter, the expansion of
$command_directory and $daemon_directory was broken.
- The address_verify_poll_count parameter value was not made
stress-dependent by default. This defeated the purpose of making other
settings stress-dependent by default with Postfix 2.6.
- Milter applications would hang up after receiving an unexpected
SMFIC_HEADER (mail header) command. This problem happened with Milters
that (legitimately) do not send replies for SMFIC_RCPT (recipient
address) or SMFIC_DATA (start of message) commands.
- Core dump while an printing error message for a malformed %<letter>
sequence in LDAP, MySQL or PostgreSQL lookup table configuration.
- Mail with zero recipients was forever stuck in the queue. This happened
when "postsuper -r" was run after all the recipients of a message were
delivered (or bounced), but before the message was deleted from the queue.
- With hostnames such as 1-2-3-4, the valid_hostname() fuction did not
recognize the '-' as a non-numeric character, causing a legitimate name
to be rejected as "invalid".
- The VRFY command did not accept a mailbox address inside <>.
- The Postfix Milter client got out of step with a Milter application
after the application sent a "quarantine" request at end-of-message
time. The Milter application would still be in the end-of-message
state, while Postfix would already be working on the next SMTP
event, typically, QUIT or MAIL FROM. In the latter case, Milter
responses for the previously-received email message would be applied
towards the next MAIL FROM transaction. This problem was diagnosed
with help from Alban Deniz.
- The Postfix SMTP server would abort with an "unexpected lookup table"
error when an SMTPD policy server was mis-configured in a particular way.
mrg