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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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.
