The Postfix architecture overview ends with a summary of command-line utilities for day-to-day use of the Postfix mail system. Besides the Sendmail-compatible sendmail (1), mailq (1), and …

Postfix runs (or has run) on AIX, BSD, HP-UX, IRIX, LINUX, MacOS X, Solaris, Tru64 UNIX, and other UNIX systems. It requires ANSI C, a POSIX.1 library, and BSD sockets.

Postfix logging to file or stdout Backwards-Compatibility Support Replacements for Deprecated Features Installation from source code Problem solving Bottleneck analysis Stress-dependent …

In particular, do not proceed here if you don't already have Postfix working for local mail submission and for local mail delivery. The first part of this document presents standard …

This website has information about the Postfix source code distribution. Built from source code, Postfix can run on UNIX-like systems including AIX, BSD, HP-UX, Linux, MacOS X, Solaris, …

This document covers basic Postfix configuration. Information about how to configure Postfix for specific applications such as mailhub, firewall or dial-up client can be found in the …

New Postfix users should first look at the following introductory documents. These introductions are hyperlinked to more advanced documents and to UNIX-style manual pages.

Postfix can be built with Postfix dynamically-linked libraries (files typically named libpostfix-*.so). Postfix dynamically-linked libraries add minor run-time overhead and result in significantly …

Available with Postfix 2.2 and earlier: fallback_relay (empty) Optional list of relay hosts for SMTP destinations that can't be found or that are unreachable.

The Postfix queue manager implements the analog of the TCP slow start flow control strategy: when delivering to a site, send a small number of messages first, then increase the …