header rewriting?

[Marek Kowal <marek.kowal@portal.onet.pl>]

Hello,

I have the following problem: when passing the mails out of my mail system
to the world with the smtp channel, I would like to replace some host names
in headers with other ones (for security reasons). So, for example, the
following header:

Received: from localhost ([127.0.0.1] helo=xxx1.zzzz.yyy.www) 
	by xxx2.zzz.yyy.www with smtp mailer 

would be changed to, let us say:

Received: from localhost ([127.0.0.1] helo=aaa1.bbb.ccc.ddd) 
	by aaa2.bbb.ccc.ddd with smtp mailer 

The replacement would be arbirarily set by admin (the best would be with
regexp). 

Any ideas?

Thanks,
Marek.
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