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sendmail, masquerading and HELO


I'm having a problem with sendmail and masquerading. We use NAT so
that the only address visible outside is the external one. All access
is done through the firewall.

The problem is that sendmail puts in the headers the internal host
name, as you can see from this message itself and here is another

Received: from fisica.ufpr.br ([] helo=hoggar.fisica.ufpr.br)
        by foo.bar.ufpr.br with esmtp (Exim 3.35 #1 (Debian))
        id 17A8E9-0001mj-00
        for <carlos@bar.ufpr.br>; Tue, 21 May 2002 08:54:53 -0300
Received: (from carlos@localhost)
        by hoggar.fisica.ufpr.br (8.11.2/8.11.2/Debian 8.11.2-1)

I've used this in sendmail.mc:



What's annoying is that some sites are using the helo= field to check
the IP address via dns. Since in this case it's an internal addres
it'll obviously not work, and these sites are refusing to receive
email from us.

Is there a way to make sendmail put the domain name in the helo field
and all the received headers?

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