Title: postfix_mailq: Linux agent better detects Postfix installation
Level: 1
Component: checks
Class: fix
State: unknown
Version: 1.2.5i1
Date: 1389182878
Targetversion: future

We new check, if there is really Postfix installed, not just the user.
Also we handle the output of <tt>/usr/sbin/ssmpt</tt>. Thanks to Thomas
Schweikle.
