SpamAssassin - Use this program to "Unspam" your mailbox(es).
Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
MailScanner - MailScanner is a open source email security system design for Linux-based email gateways.
sSMTP - sSMTP is a simple MTA to deliver mail from a computer to a mail server.
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...
Sendmail - Sendmail is a general purpose internetwork email routing facility that supports many kinds of...