Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
Proxmox Mail Gateway - Protect mail server against spam, viruses and malware with Proxmox Mail Gateway security for businesses, government, education and non-profit organizations.
sSMTP - sSMTP is a simple MTA to deliver mail from a computer to a mail server.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Sendmail - Sendmail is a general purpose internetwork email routing facility that supports many kinds of...
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...