Hello we have 2 exchange server in the same lan : 1 is 5.5 (first )2 is 2000 i can exchange mail between the 2 servers but i can't send mail on the internet from the 2000 serveur with 9318 and 9322 errors ( unable to relay ) it works fine with owa 2000 with the same user and address !!!! Can anybody help me Thank's Gilles