[exim] Exim push localhost name in mail

Hello;

I have a problem. I'm newbie for exim. I use manualroute exim to qmail work.
Exim fetch plesk db users and passwords work perfectly no problem with send
and recieve but;

mainlog;

2008-04-21 13:07:03 1JnsvP-000KzC-L2 <= "xxx@??? H=([
192.168.1.203]) [xxx.xxx.xxx.xxx] P=esmtpa
A=plain:xxx@???<plain%3Axxx@???>S=657 id=
480C672C.6000308@???

How can I remove mail.xxx.xxx domain name mail headers

Thank You