Bounce emails without ticket numbers

How do I have the system bounce emails that do not contain ticket numbers? When ever I enable this option in sysconfig the POP3PostMaster.pl PID always hangs and I get the following error: [Notice][Kernel::System::PID::PIDCreate] Can't create PID PostMasterPOP3, because it's already running yourhost.example.com/1837)!

Le Sat, 27 Jan 2007 03:36:57 -0500
"Maurice James Ny"
How do I have the system bounce emails that do not contain ticket numbers?
Same problem here , I only get :
"Your email with ticket number "" is bounced to "xxx@domain".
Contact this address for further informations."
So, it seems there is a problem with
participants (2)
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Martin Hamant
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Maurice James Ny