When anyone internally sends an email to one of our users they get an auto NDR email thats says:
The following recipient(s) cannot be reached:
'Bob Green 'on 19/09/2012 12:44
"The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address"
However if using owa and manually typing in the user's email address they seem to receive it fine. They are receiving external email fine and sending email internally and externally fine.
I'm wondering if our global address list has got corrupt. Also if any user sends an email to a distribution list which has the same user name included they don't receive this email either - maybe this is related
Any suggestions? - Were using SBS 2003 and outlook 2010