ravisha_22 -> RE: Replying to old POP messages from exchange (3.Nov.2008 10:13:12 AM)
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for the first NDR, the issue is with DNS, check dns functionality using nslookup, for second error, the issue seems to be with receive connector, check if pop servers are configured correctly and if the receive connector is allowed for proper authentication. If the user is external, try tracking the message, if it does not show any proper data, enable logging for POP3 and check, it will give solid clues.
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