We have microsoft exchange handling mail from 5 different domains, eg *@mydomain.com, *@hisdomain.co.uk etc.
Initially the MX records pointed to the public ip address of the server and all worked well..... mail sent to firstname.lastname@example.org were forwarded via the exhange server to the appropriate user.
Now with with horrendous spam problems we have decided to change the mx records of the domains and point them back to the ISP's mail software.
We have create mail forwarding accounts from all the live e-mail accounts from the various domain and are forwarding them all to 'email@example.com, (bouncing all mail and undeliverable)
We now get the exchange server to collect from thepop account called firstname.lastname@example.org, which it does fine, and it forwards all the *@primarydomain.com mail to the correct users, however it sends all other mail to the email@example.com.
Any suggestions would be appreciated.