Hi, We have Exchange 2003 and have a recipient policy (On Distribution List) set on our users, It was working fine before and suddenly users on our organization cannot receive email anymore from there recipients (one particular domain *@domainname.com) , when I check the logs using the message tracking, Multiple NDR was generated event id 1030. If the account of the user is set to everyone in exchange general, that user can receive an email from that particular recepient (*@domainname.com). also when I check the log in our mail server smart host the email address of the sender is different btv1==551f804f4ba==recepient@domainname.com instead of recepient@domainname.com I'm currently out of options here and hope someone can give an idea to help me resolve our problem. Sincerely, Gerald