This is a link to the ssmtp binary. It invokes /usr/sbin/sendmail with the -bi option. It is provided for compatibility with the sendmail program.
In Fedora sSMTP supports /etc/aliases as a text file so there is no need to regenerate a database.
This manual page was written by Christoph Lameter <email@example.com>, for the Debian GNU/Linux system. Minor fixes by Matt Ryan <firstname.lastname@example.org> and Manuel Wolfshant <email@example.com>.