On Tue, 2005-02-22 at 00:19 -0500, Stuart D. Gathman wrote:
Can SPF disrupt the delivery of valid eMail?
No. It only disrupts the delivery of email with forged MAIL FROM.
Unfortunately, some people have become accustomed to forging their email,
and complain bitterly when required to say where they are really sending it
from.
Stuart is being somewhat disingenuous with his use of the word 'forged'.
What he refers to as 'forgery' is in fact common practice. When users
forward mail from one site (a vanity domain, old university, old
employer etc.) to a real mailbox elsewhere, it's almost always done with
the original sender's address intact. That's what Stuart calls
'forgery'. And SPF breaks it.
See http://david.woodhou.se/why-not-spf.html for further discussion and
some alternative schemes which you might want to consider instead, which
don't have such problems.
--
dwmw2