Hello All, I have a strange problem, when some of my users send internal email to one a user they get an NDR stating that a differant user does not exist, ex. user A send email to mkowatch user A gets an ndr stating lmalm is not a valid user. Lmalm is a user that left the company over a year ago and this just started a couple of weeks ago. System is Exch 2k3 sp2 on windows 2k3 sp1 migrated from nt 4.0 exch 5.5.