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So here's the problem: I have a webserver that's currently serving quite a number of different domain names as virtual hosts for apache. Lets say the default domain is

When I use sendmail (via PHPMailer) from, the mail that is sent has the header Received: from, even though I set the From header to

I suspect the mismatch is why these emails are being filtered as spam (from what I've read on the gmail spam filter)

What configuration in the email headers, sendmail, or postfix do I need to change to ensure emails from other virtual hosts are actually sent from their respective domain names, and thus no longer filtered as spam?

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