Hi Everyone, So I installed Exchange server yesterday and though i had done it all. then i get this error for specific domains only... priscilla.thesecretary@eaded.org on Wed, 23 Mar 2011 15:25:07 +0300 There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. *<mymajordomain.com #5.5.0 smtp;550-Verification failed for < martin@mymajordomain.com>>* So the basic set up is for smtp Client W/s (Outlook, Thunderbird, ) Exchange Server (Domain - Mymajordomain.com {Smtp Record points to this servers ip address on my domain host on the net.}) Recepients server (Most likely doing a reverse dns lookup) Receiving is a different setup but it works fine. Please HELP ;-( -- *Kind Regards Martin Muraguri C: +254726937792 / +254736594985 E: martinmur87@gmail.com / martin.m@OctoberICT.com W: www.OctoberICT.com October ICT *Plug and Play!**