Dear Colleagues,
My users have been using MS outlook with exchange 2000 to send messages within the organisation and also to download pop3 mails from the internet. Recently some of the users started getting error messages when they try to send mails to people they had been communicating with on the internet in the past. The worrying thing is that sending a message to some internal recipients returns a non-delivery report. After tracking the problem I realised that if I order in which mails are processed so that the pop transport is at the top, andmy exchange transport is next followed by exchange remote transport….the problem disappears. As I said we have been using the exchange server 2000 for 3 years and this problem has only just occured, and is not affecting all users.(i.e some users still have the microsoft exchange at the top of the transport list. So what could have caused this problem. Sometimes the error says the user does not have permission to send a message to the recipient.