Hi, On a new Exchange 2003 Server I noticed that a few existing mail-enabled users have SMTP addresses, but the email address format is unfamiliar to me. It is something lime this: user1@xxxxxxxxx Instead of what I would expect: user1@xxxxxxxx The server AD domain happens to be mail01.abcd.abcd, and the AD domain is abcd.abcd. Is there a connection between the AD domain name and SMTP address as some kind of "default" SMTP address? To add real "external" SMTP addresses, do I simply delete these SMTP addresses and replace with the real ones? Or must I keep these AD domain SMTP addresses and add the external ones as well? If so, what would I lose by deleting the AD domain SMTP addresses? Is there any information on this format for SMTP addresses in Exchange and what it means etc.? TIA! Mike