I created a custom Postmaster module (Simple.pm) and tried to use it like this: Kernel/Config.pm [...] # Job Name: Custom Postmaster # (use custom postmaster module) $Self->{'PostMaster::PreFilterModule'}->{'Custom Postmaster'} = { Module => 'Kernel::System::PostMaster::Filter::Simple', }; [...] When the PostMasterPOP3.pl cron runs, I get the following message: Can't load module Kernel::System::PostMaster::Filter::Simple! Traceback (30596) Module: Kernel::System::PostMaster::Run (v1.40.2.1) Line: 131 Module: main::FetchMail (v1.11) Line:: 169 Module: bin/PostMasterPOP3.pl (v1.11) Line: 106 Any advice would be appreciated, Tyler Hepworth