Hi all, specially skilled administrators! We have big problems with our open relay Exchange 2000. Yesterday has occured this problem, and reason or solution is not known! I have read discussion list about open relay, tutorial by Mark Fugatt "Understanding Relaying and ...", M$ KBs }310380, 310356, ...) ... all that seems so easy! 1) configure SMTP virtual server 2) configure connectors But it doesn´t work! After all I think, that MMC doesn't work properly! How can I verity, that changes in MMC do real changes in registry? Or, is this a right-time for restore system state?! Thanks for any help leading to resolve my problem! Pavol.