If an Exchange server user, email@example.com, sends an e-mail to firstname.lastname@example.org on the other server, user1 gets a reply that the message was not delivered and that there was an unknown user (the Exchange server is looking for user2 and user2 is on the other server).
How can I solve this problem?
Do you have comments on this Ask the Expert Q&A? Let us know.
Related information from SearchExchange.com:
Dig Deeper on Microsoft Exchange Server Administration
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.