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