Exchange 2000 sp2 Problem: I can send email but everything that is sent to me or anybody else in the firm gets returned as: <<< 550 5.7.1 Unable to relay for DanC@xxxxxxxxxxxx 550 5.1.1 <DanC@xxxxxxxxxxxx>... User unknown <<< 554 5.5.2 No valid recipients I've also gotten this: 451 4.4.1 reply: read error from .... <danc@xxxxxxxxxxxx>... Deferred: Connection reset by ... Warning: message still undelivered after 6 hours Will keep trying until message is 1 day old I telnet it and it works fine but when I send myself an email form outside I get the error above. Any Ideas? Please send replies to dc@xxxxxxxxxxxxxxx Thanks Dan