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Re: [Asrg] Re: SPF abused by spammers

Markus Stumpf wrote:

On Thu, Sep 16, 2004 at 11:02:00PM +0200, Claus Färber wrote: 

It can't break forwarding for bounce message because bounce messages
don't have a domain name in their 2821.MAILFROM.


Hmmm ... I can't find it anymore right now, but shouldn't SPF conform
bounces have a non empty envelope-sender, as a workaropund to prevent
spammers sending their messages with <> only?

Hello? Ever heard of HELO? :) Sending with en empty envelope-from, to try and circumvent SPF, is pointless: checks are done against HELO, in that case (as if tested against, say, postmaster at HELO). Consequently, since there is nothing to prevent, there is nothing to send "non empty" either (where empty was the case).

- Mark


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