Merge branch 'master' into 'stable-3.1'

Marius Burkard

2016-05-04 f6513f0be58f1dd441f3778f8a9d259bbc7267e4

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amavis unix - - - - 2 smtp
        -o smtp_data_done_timeout=1200
        -o smtp_send_xforward_command=yes