I want to return any emails with an empty subject with otrs. Currently, I have something like this in Config.pm: $Self->{'PostMaster::PreFilterModule'}->{'1-Match'} = { Module => 'Kernel::System::PostMaster::Filter::Match', Match => { Subject => '', }, Set => { 'X-OTRS-Ignore' => 'yes', }, However, messages still come through to OTRS and are allocated a ticket number. Should I be doing this filtering with OTRS, or with something else like procmail? Regards, Dan