Has anyone seen an NDR like this before with many question marks in it and a letter? How is the best way to track this down? ????????????m??@domain.com on 2/1/2006 3:28 PM 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. I end up receiving a 5.1.1 "Bad Address" error code back as well from the Exchange server. When I do a message tracking in Exchange 2003 I also see the message as being sent to: C=US;A= ;P=ExchangeOrgName;O=Los Angeles;DDA:SMTP=????????????m(a)domain.com; Ion V. Gott