Postfix – mail transfer agent

Postfix is a free 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 MTA.

Postfix is the default MTA for a number of operating systems such as Ubuntu.

Although IBM supported the Postfix development, it abstains from control over its evolution.

Features include:

  • Transport Layer Security (TLS).
  • 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 more.
  • Milter support compatible with Sendmail milters.
  • Using Policyd-weight, can check e-mail headers against various DNSBLs and for RFC compliance, and reject near-certain spam ahead of receiving the body of the messages, lessening server load.
  • Junk mail control.
  • Non-repeating (long) queue IDs.

Support: Docs
Developer: Wietse Venema and others
License: IBM Public License

Postfix is written in C. Learn C with our recommended free books and free tutorials.

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