Postfix is an attempt to provide an alternative to the widely-used Sendmail program. Postfix attempts to be fast, easy to administer, and hopefully secure, while at the same time being sendmail compatible enough to not upset your users.
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The installation/upgrade procedure did not automatically create the data_directory. In the "new queue manager", the _destination_rate_delay code needed to postpone the job scheduler updates after delivery completion, otherwise the scheduler could loop on blocked jobs. The queue manager used <transport>_concurrency_failed_cohort_limit instead of <transport>_destination_concurrency_failed_cohort_limit as documented. The SMTP client disabled MIME parsing despite non-empty settings for smtp_header_checks, smtp_mime_header_checks, smtp_nested_header_checks, or smtp_body_checks.
This version introduces multi-instance support. TLS (SSL) support was updated for elliptic curve encryption. The Milter client now supports all Sendmail 8.14 Milter requests. Postfix no longer adds (Resent-) From:, Date:, Message-ID:, or To: headers to email messages with "remote" origins. Stress-adaptive behavior is now enabled by default. This allows the Postfix SMTP server to temporarily reduce time limits and error-count limits under conditions of overload, such as a malware attack or backscatter flood.
Reduced TCP performance is avoided when reusing an
SMTP connection with a larger than 4096-byte TCP
MSS value. The cleanup server did not update the
queue file's recipient count field after a Milter
application added or deleted a recipient.
The SMTP server did not ask for a client
certificate with "smtpd_tls_req_ccert = yes".
Reduced TCP performance is avoided when reusing an
SMTP connection with a larger than 4096-byte TCP
MSS value.
