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 protected]> Wed, 13 Apr 2016 15:44:14
+0000
** Changed in: ssmtp (Ubuntu)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/654065
Title:
ssmtp.conf security
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