[exim] Domain Alias

Hi,

I want to create domain aliasing in exim.

e.g
test1.com is alias of test2.com. So when some one send mail to
particular user of test1.com then that mail will be forwarded to
test2.com of that user.

It is possible in EXIM ?
I know the user aliaing but want to create domain alias.

OR have to change in vm-pop3d ? We are using vpop3d for vm-pop3d.

Please rely me asap. Its very urgent for me

Thanx
--
M.A.Shaikh
Linux System Administrator