(SOLVED) strange domain conversion

Dear All,

our mail doman name is mydomain.com

we also have a drc mail with domain name apc.mydomain.com which located out of our server (webmail)

when we test to send email from sender@apc.mydomain.com to rec@mydomain.com, the rec user see the sender mail address is sender@mydomain.com instead of sender@apc.mydomain.com

But it shows correctly on other domain such as yahoo, or other mail domain.

Any clue?

Thanks a billions.

Yusuf abdella

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Resolution :

I have set inthe IMMS (av mail scan) to deliver from *.mydomain.com it should be changed to mydomain.com only.