msmtp is an SMTP client.
In the default mode, it transmits a mail to an SMTP server (for example at a
free mail provider) which does the delivery.
To use this program with your mail user agent (MUA), create a configuration
file with your mail account(s) and tell your MUA to call msmtp instead of
/usr/sbin/sendmail.
Features include:
- Sendmail compatible interface (command line options and exit codes).
- Authentication methods PLAIN, LOGIN, CRAM-MD5, DIGEST-MD5, GSSAPI, and NTLM.
- TLS/SSL both in SMTP-over-SSL mode and in STARTTLS mode. Full certificate trust checks can be performed. A client certificate can be sent.
- Fast SMTP implementation using command pipelining.
- Support for Internationalized Domain Names (IDN).
- DSN (Delivery Status Notification) support.
- RMQS (Remote Message Queue Starting) support (ETRN keyword).
- IPv6 support.
- Support for multiple accounts.
msmtp is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.