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.
- 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.
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