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Subject: Re: HELO / MAIL FROM vs client
From: Wietse Venema (wietseporcupine.org)
Date: Tue Jul 04 2000 - 08:57:43 CDT

Gert-Jan Looy:
> Dear list,
>
> Looking through documentation and FAQ I cannot find out how
> to resolve following problem:
>
> Someone connecting from the outside to our firewall-postfix
> and then sending mail with "MAIL FROM: someonesiemens.nl" ,
> so that the recipient thinks that the mail really comes
> from Siemens , which it does not.
>
> What I would like is to match the clients real domain with the domain
> entered in the "helo" and "mail from" entries.
>
> Is this possible?

It is possible. However, doing so breaks email forwarding, so
I will not spell out the details.

        Wietse