[otrs] Filter emails with empty subject

[Dan Irwin]

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
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