May 26, 2018
Secure alternative to widely-used Sendmail
Postfix attempts to be fast, easy to administer, and secure, while at the same time being sendmail compatible enough to not upset existing users. Thus, the outside has a sendmail-ish flavor, but the inside is completely different.
Connection cache for SMTP, DSN status notifications, IP version 6, Plug-in support for multiple SASL implementations Cyrus, Dovecot, TLS encryption and authentication, Configurable status notification message text, Access control per client/sender/recipient/etc, Content filter built-in, external before queue, external after queue, Berkeley DB database, LDAP database, MySQL database, PostgreSQL database, Maildir and mailbox format, Virtual domains, VERP envelope return addresses and others.