Do it this way. First stop SMTP service, then rename badmail folder into badmail1, and create the new folder and name it badmail (you don't have to rename it but it could help). It will prevent system from freezing. Then delete all badmail files through explorer (may take hours!, so plan it carefully), and then delete badmail1. These files are messages that never found recipients, so they will keep coming. You should check the folder periodicaly or make a script to empty it on regular basis (some messages could be real ones-sender misspelled the recipient address). Read MS KB 315631-it's nice thing. These files can give you a lot of info about what's going on with your messaging system. Regarding warning message send me the full message with its source.