Package list
mail-mta / courier : An MTA designed specifically for maildirs
mail-mta / esmtp : User configurable relay-only Mail Transfer Agent with a sendmail-like syntax
mail-mta / exim : A highly configurable, drop-in replacement for sendmail
mail-mta / msmtp : An SMTP client and SMTP plugin for mail user agents such as Mutt
mail-mta / netqmail : qmail -- a secure, reliable, efficient, simple message transfer agent
mail-mta / notqmail : Collaborative open-source successor to qmail
mail-mta / nullmailer : Simple relay-only local mail transport agent
mail-mta / opensmtpd : Lightweight but featured SMTP daemon from OpenBSD
mail-mta / postfix : A fast and secure drop-in replacement for sendmail
mail-mta / proton-mail-bridge : Serves ProtonMail to IMAP/SMTP clients
mail-mta / qpsmtpd : qpsmtpd is a flexible smtpd daemon written in Perl
mail-mta / sendmail : Widely-used Mail Transport Agent (MTA)
mail-mta / ssmtp : Extremely simple MTA to get mail off the system to a Mailhub