My mail.xxxx.com is not listening to my main domain www.xxxx.com

Hi There,

I have created some domain in virtualmin there was problem with its alias like when i view some page at

www.aaaa.com its listen to other subdoamin www.xxxx.com but somehow i rectified that by adding serveralias name to it after that its worrking fine

but now i am facing new problem like when i visit mail.aaaa.com its listening to example.xxx.com but it should listen to aaaa.com

my all of the mail.aaaa.com and mail.bbbb.com, mail.cccc.com listening to example.xxxx.com.

Where went wrong????

Please help me out

Thanks a lot