Re: [Fwd: Re: No SPF_FAIL flag, why?] On Wed, 27 Feb 2008, Russell Jones wrote:

>
> If what you said is right, why does SPF only look at the return-path address and not the From: address?
> Nobody pays attention to return-path, they only look at From to see who their mail client says the email
> address is from.
>

SPF is a technology that was intended to provide a method for MTAs to 
validate the sending address at the SMTP level. During the intial steps of 
the SMTP protocol the MTA only has the HELO-host, envelope-from, and 
envelope-to addresses to work with (all the headers and body are in the 
SMTP-Data phase).

(usually the envelope-from address is interpolated into the headers as the 
Return-path header during the delivery process).


-- 
Dave Funk                                  University of Iowa
        College of Engineering
319/335-5751   FAX: 319/384-0549           1256 Seamans Center
Sys_admin/Postmaster/cell_admin            Iowa City, IA 52242-1527
#include 
Better is not better, 'standard' is better. B{


