spf-discuss
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RE: [spf-discuss] Misuse of Return Address

2006-12-08 04:36:32
Speaking of the SMTP client, all MTAs act like any SMTP client to send
email to another SMTP server using port 25.  When you say that inject
mail is different for forwarders and humans, I say otherwise as you
cannot tell the difference.  I suspect that even a network packet
sniffer could not tell the difference either.

Jason

"Seth Goodman" <sethg(_at_)goodmanassociates(_dot_)com> 12/07/2006 6:00 PM

David MacQuigg wrote on Thursday, December 07, 2006 1:20 AM -0600:

The word "inject" is a little vague, but from this context I assume
it
would include both an original transmission and a forwarding.  For
this discussion, we need a distinction between those two actions.

Inject mail means you connect as SMTP client to an SMTP server and
attempt to transfer a message to them.  Message originating and
forwarding are different from the system operator's perspective, but
not
to SMTP and not to recipients.  The SMTP server you offer a message to
only knows that you want to hand them a message.  They neither know
nor
care the origin of that message.  SPF arose from the desire to change
that in a way that SMTP servers could do lightweight validation of
sender domain prior to entering the DATA phase of SMTP.


<snip>

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