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/usr/share/doc/ssmtp/README.Debian is in ssmtp 2.64-8.

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ssmtp for DEBIAN
----------------

This is a secure, minimal mail sender.

There is one configuration file in /etc/ssmtp/ssmtp.conf where all parameters
are set. Support for debconf has been added, so to change the parameters use
the command "dpkg-reconfigure ssmtp".

SSMTP also supports reverse aliases if the file /etc/ssmtp/revaliases is
present. See ssmtp(8) for details.