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David Woodhouse wrote:
On Sat, 2008-01-05 at 21:04 +0000, Julian Mehnle wrote:
David Woodhouse wrote:
You've already ignored my answer to that, conveniently. And that
wasn't it.
I am sorry, I must have overlooked it. Can you please repeat it? I
promise not to ignore it a second time.
It's the paragraph after "why would you need multiple handles for the
same sending host?". The one which starts "Although actually..." and
ends "...there's nothing in CSV which prevents that from working."
Thanks. Alright:
David Woodhouse wrote:
[...]
why would you need multiple handles for the same sending host?
Although actually if the sender _really_ wants to, they _can_ give a
different HELO name according to the mail they're sending. It's a bit
pointless, but some people seem to do it anyway. And there's nothing in
CSV which prevents that from working.
So you're saying it is up to the sending host to provide varying HELO
identities if the receiver is supposed to be able to discriminate mail
that originates from varying senders but is all sent through that common
host. I.e. they would say "HELO mehnle.net.mailout.isp.com".
Will they do that even for individual localparts (which SPF does support),
i.e., will they say "HELO julian._.mehnle.net.mailout.isp.com"?
That seems like a gross misuse of the HELO identity to me, plus I still
have to implement all the cryptographic SRS/BATV/SES stuff to actually
have MAIL FROM protected, plus I will still get (partial) SMTP
transactions for misdirected bounces (although I can abort them after
MAIL FROM), or at least I get all the incoming callbacks.
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