Hi there, We are using win2k server (SP3) and E2k (SP3). Some of the users are faxcing problem while sending the mails to some users. They get NDR after 3 days that states the following error Could not deliver the message in the time limit specified. Please retry or contact your administrator. <aliasex2000.dotnet.net #4.4.7> both the users are in same organization. When I try to send the test mail it is delivered to both the users but one user is notr able to send the mail to second user. I tried this error on technet and I found the following article "PSS ID Number: Q301401 But this article talks about applying latest service packs which I've already applied. Can anybody help please.......