We have 2 Domino servers running McAgee GroupShield that receive incoming email from a pair of SMTP servers, scan them for malware, then route them to the recipients. One of these servers will mark undeliverable messages as dead after 45 minutes or an hour, after which an agent we have running hourly deletes them. The other one won't mark them as dead ever and we can't figure out why. IBM Support suggested deleting the mail boxes and letting Domino recreate them on the affected server but that didn't help. Then they suggested adding a MAILTIMEOUTMINUTES parameter to the NOTES.INI Settings tab of the server configuration, which didn't help either. We are at a loss as to what to do. The mail boxes fill up with messages for associates who no longer work here and undeliverable spam and when the reach a message count of something over 1,000 messages the server will stop routing. All suggestions are greatly appreciated. Thanks in advance.