North American Network Operators Group
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Re: Spammers Skirt IP Authentication Attempts

  • From: Stephane Bortzmeyer
  • Date: Fri Sep 10 04:00:14 2004 
On Wed, Sep 08, 2004 at 03:15:14PM -0500,
 Robert Bonomi <[email protected]> wrote 
 a message of 37 lines which said:

> Same thing applies for 'simple' forwarding via sendmails '~/.forward'
> mechanism.  the mail server 'accepts' the mail from the original source,
> and then 're-sends' to the new destination.  That re-send originates as
> the _forwarding_party_, WITH an 'envelope from' of that forwarding
> party,

Sorry, this is simply not true (sendmail, postfix, etc, always keep
the original envelope from when forwarding).

> An SPF check of the _immediate_ sender does *NOT* break forwarded
> mail.

Even SPF people say it:

http://spf.pobox.com/faq.html#forwarding