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+++ Postfix +++
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Postfix is an open source mail transfer agent (MTA), a computer program for the routing and delivery of email. It is intended as a fast, easy-to-administer, and secure alternative to the widely-used Sendmail. Formerly known as VMailer and IBM Secure Mailer, it was originally written by Wietse Venema during a stay at the IBM Thomas J. Watson Research Center, and continues to be actively developed today.
Postfix is the default MTA for a number of Linux distributions and the last two releases of Mac OS X (Panther & Tiger). It is released under The IBM Public License 1.0, a GPL-like License which has, however, been declared incompatible with the GPL.
Postfix can be compiled on: AIX, BSD, HP-UX, IRIX, Linux, MacOS X, Solaris, Tru64 UNIX and, generally speaking, on every Unix-like OS that ships with a C compiler, standard POSIX development libraries and all the libraries required for handling BSD sockets.
Postfix was first released in the late '90s. The version 2.2 supports:
* TLS (Transport Layer Security).
* delegation of SMTP policies to an external process (this allows Greylisting) and advanced content filtering.
* Different databases for maps: Berkeley DB, CDB, DBM, LDAP, MySQL and PostgreSQL.
* mbox-style mailboxes, Maildir-style mailboxes, and virtual domains.
* Address rewriting (envelope and header), VERP, SMTP-AUTH via SASL, and much more.
The version 2.3 supports:
* Milter [1]
One of the strengths of Postfix is its resilience against buffer overflows. Another one is its handling of large amounts of e-mail. Postfix is built as a cooperating network of different daemons. Each daemon fulfills a single task using minimum privileges. In this way, if a daemon is compromised, the impact remains limited to that daemon and cannot spread throughout the entire system. There is only one process with root privileges (master), and a few (local, virtual, pipe) that actually write to disk or invoke external programs.
Release
Master
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