msmtp -- SMTP plugin for MUAs

This is a simple program that works as an "SMTP plugin" for Mutt
and probably other MUAs (mail user agents).  msmtp forwards mails
to an SMTP server (for example at a free mail provider) which does
the delivery.

Features include:
    * SMTP AUTH methods PLAIN, LOGIN, CRAM-MD5 and XOAUTH2
    * TLS encrypted connections
    * IPv6 support
    * robustness
    * detailed error messages (including the full answer of the
      SMTP server) if something goes wrong
    * sendmail compatible exit codes (which most MUAs understand).

Simply tell your MUA to call msmtp instead of /usr/sbin/sendmail.

Homepage:
https://marlam.de/msmtp/
