Built from source code, Postfix can run on UNIX-like systems including AIX, BSD, HP-UX, Linux, MacOS X, Solaris, and more. Postfix is also distributed as ready-to-run code by operating system vendors, appliance vendors, and other providers.

General configuration Basic configuration Small/home office hints and tips Standard configuration examples Address rewriting Virtual domain hosting SASL Authentication IP Version 6 Support SMTPUTF8 support TLS Encryption and authentication TLS Forward Secrecy TLSRPT Protocol Support Multiple-instance management Postfix logging to file or stdout

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 STANDARD_CONFIGURATION_README file. But don't go there until you already have covered the material presented below.

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.

The Postfix SMTP server receives mail from the network and is exposed to the big bad world of junk email and viruses. This document introduces the built-in and external methods that …

This document presents a number of typical Postfix configurations. This document should be reviewed after you have followed the basic configuration steps as described in the BASIC_CONFIGURATION_README document. In particular, do not proceed here if you don't already have Postfix working for local mail submission and for local mail delivery.

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-smaller Postfix executable files.

Please choose a Postfix Download SitePlease choose a Postfix Download Site

However, when support for multiple Postfix instances is configured, postfix (1) executes the command specified with the multi_instance_wrap - per configuration parameter.

To manage algorithm selection, OpenSSL introduces new TLS group syntax that Postfix will not attempt to imitate. Instead, Postfix now allows the tls_eecdh_auto_curves and tls_ffdhe_auto_groups parameter values to have an empty value.