On Wed, 07 Jan 2009 12:22:24 +0100 Alessandro Vesely
<vesely(_at_)tana(_dot_)it> wrote:
spfdiscuss(_at_)caution(_dot_)icompute(_dot_)com wrote:
The sense I get in other forums is that SPF "can't be used" because it
"breaks forwarding".
One reason why "forwarding" may be considered broken is that that term
doesn't actually have a definite technical meaning in SMTP. To wit,
RFC 5321 added (w.r.t. RFC 2821) an apparently inconsistent phrase
about forwarding. Section 3.9.2 (lists) begins with:
| A mailing list may be said to operate by "redistribution" rather
| than by "forwarding".
apparently implying that "forwarding" is a different operation than
sending mailing list messages. However, the phrase added to the same
paragraph says that:
| the key difference between handling aliases (Section 3.9.1) and
| forwarding (this subsection) is the change to the backward-pointing
| address in this case.
which implies that sending mailing list messages _is_ "forwarding".
The standard literally says that forwarding with a changed return
address is not forwarding. Should that be interpreted like the Baima
Lun saying that a white horse is not a horse?
With a mailing list, a message is sent to the list manager, it is
delivered, and then a new message (with a usually modified body) is created
and sent to the subscriber list. So whatever 'forwarding' is, it's pretty
clearly not a mailing list.
Scott K
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