I have two different domains. One has email disabled, and the mx records redirected to another server -- which works fine. part two is the problem. The second domain has email hosted locally, and one user is forwarding their email to the server with the MX redirect. Problem: The user gets their email, but if the sender happens to be from the second domain, they get a bounce from the server: Again, the intended receiver gets the e-mail, but the sender gets a bounce. How do I fix this?