On Wed, Jan 21, 2004 at 02:39:55AM +0100, Julian Mehnle wrote:
That part I *do* understand. What I do *not* understand is why reading (and
therefore downloading) the header lines is required in the first place?
In another message, please find and read this part:
If there is a "Sender" use it for checking and ignore the "From" else
use "From".
The problem with this approach (and others approaches based on header
fields, rather than the envelope) is that it forces the MTA to
actually accept the message, before being able to reject it.
With SPF as it stands now, the mail transaction can already be aborted
before a single byte of message data is transferred.
You were responding to this sub-thread so logically I assumed you were
talking about RFC822 "Sender: " and "From: " vs. RFC821 "mail from:"
Alex
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