[CentOS] Sendmail Replay problem

Hi , guys :


I have a problem about the sendmail replay . The following is my condition:

I have installed the sendmail server on my laptop which installed  CentOS
5.5 x86 64,
and I want to set up the sendmail replay.


That is to say . If my linux account called test and his mail address is
test at test.com,
when he get the new mail, then the server send the mail to the company mail
server ,
 the new mail address is test at aa.com



I am confused on it . Could  someone give me some suggestions?

Thanks in advance....
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