All, we're seeing frequent occurrences of the following error (sent to the cron email address): ERROR: OTRS-PM3-10 Perl: 5.8.8 OS: linux Time: Sun Jul 29 11:57:02 2007 Message: Need User or UserID! Traceback (28211): Module: Kernel::System::User::GetUserData (v1.64) Line: 126 Module: Kernel::System::Ticket::Article::SendAgentNotification (v1.142) Line: 1771 Module: Kernel::System::Ticket::Article::ArticleCreate (v1.142) Line: 404 Module: Kernel::System::PostMaster::FollowUp::Run (v1.54) Line: 217 Module: Kernel::System::PostMaster::Run (v1.65) Line: 292 Module: main::FetchMail (v1.25) Line: 206 Module: /usr/share/otrs/bin/PostMasterPOP3.pl (v1.25) Line: 125 OTRS 2.2.1, debian etch. Customer user data is sourced from a separate database - not sure if this is relevant. Would appreciate any suggestions. At this point, I don't even know which point in the ticket work flow is triggering these errors. Thanks in advance. .... Jonathan.