I have an Exchange Server 2003. Recently, I added Recipient Policies to host multiple domains. When a user's email address is configured to use one of the new domains as their primary address, outgoing email is often detected as spam and does not reach the intended recipient even though it appears to transmit successfully on my end. If I change the user’s primary email address back to the original domain, then email seems to transmit properly. There does not seem to be any problems with incoming email for any of the domains, as the proper MX records were setup. How can I ensure that outgoing email will transmit properly when using one of the additional domains as a user’s primary email address? Please note that my server’s IP address is not blacklisted.