Merge branch 'patch-1' into 'stable-3.1'

Till Brehm

2016-04-27 65dc1a19e784f20f4b275c0fdc519d27a4a9b08e

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