Merge branch 'darkalex/ispconfig3-mailsec-sendas' into stable-3.1

Marius Burkard

2016-01-20 6332aca4c482615a2168b3afad3170954b9f36a6

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