local mail domains

I have loaded ids 51 and ims 52 on a new server. I want this server to receive mail at 3 different email addresses AKA uid@guinness.pint.com, uid@harp.pint.com and uid@bass.pint.com... The directory is setup a dc=pint,dc=com. Half of the mail server users have uid@guinness.pint.com as their main address and the other half have uid@harp.pint.com. DNS entires point all domains to the same ip address. MX records do the same. However, if I try to send mail to any of the email addresses, the only one that works is guinness, since it was the name of the server. Any help would be appreciated.

[606 byte] By [707501] at [2007-11-25 8:10:10]