Exchange 2007. At some point in the past user@here.com had an address of otheruser@here.com. I suspect that e-mail address was a x500 then the address was changed to user@here.com. Upon migration to 07 the old was dropped leaving just user@here.com. However when someone internal or external would email user@here.com the sender would of course receive an ndr saying otheruser@here.com doesn't exist. User@here.com would receive the sent e-mail. I gave the user the old x500 email address and now the user receives 2 of every e-mail (internal & external) one to user@here.com and 1 to otheruser@here.com. Removing the x500 while making the user happy as they only receive the 1 email addressed to them. But the sender receives a rejection and becomes confused. Why is exchange splitting up the email that's addressed to 1 person? I've read a lot of stuff about auto-complete in outlook but that shouldn't matter from senders externally that are sending to the correct e-mail address of user@here.com it's not getting a GAL and seeing x500. This is obviously or obvious to me it's happening on exchange. I know if I delete the x500 internal users who have it in their auto-complete will get a bounce I'm okay with that. Goal is to delete x500 address from exchange / AD where ever it's pulling information that this address exists. Yes I know I'll have to delete it from users e-mail address in Exchange.

On Fri, 2 Sep 2011 23:59:00 +0000, hutchnate wrote: > > >Exchange 2007. At some point in the past user@here.com had an address of otheruser@here.com. I suspect that e-mail address was a x500 then the address was changed to user@here.com. Upon migration to 07 the old was dropped leaving just user@here.com. However when someone internal or external would email user@here.com the sender would of course receive an ndr saying otheruser@here.com doesn't exist. User@here.com would receive the sent e-mail. I gave the user the old x500 email address and now the user receives 2 of every e-mail (internal & external) one to user@here.com and 1 to otheruser@here.com. > >Removing the x500 while making the user happy as they only receive the 1 email addressed to them. But the sender receives a rejection and becomes confused. > >Why is exchange splitting up the email that's addressed to 1 person? That person's mailbox (user@here.com) probably has a rule that copies the other person (otheruser@here.com). Or there's a delegate on that person's mailbox. Or the mailbox is assigned a alternate recipient. --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP