This bug was fixed in the package ssmtp - 2.64-8ubuntu1
--------------- ssmtp (2.64-8ubuntu1) xenial; urgency=medium
* Remove world read access to /etc/ssmtp/* and chgrp to "mail". Install the ssmtp binary as setgid and owned by "root:mail". LP: #654065, Closes: #661954
-- Simon Deziel <email address hidden> Wed, 13 Apr 2016 15:44:14 +0000
This bug was fixed in the package ssmtp - 2.64-8ubuntu1
---------------
ssmtp (2.64-8ubuntu1) xenial; urgency=medium
* Remove world read access to /etc/ssmtp/* and chgrp to "mail".
Install the ssmtp binary as setgid and owned by "root:mail".
LP: #654065, Closes: #661954
-- Simon Deziel <email address hidden> Wed, 13 Apr 2016 15:44:14 +0000