It occurred to me that it might help for me to provide more context to
the questions I asked. I was possibly relying too much on the thread
context...
On 6/18/2022 3:40 PM, Noel Butler via mailop wrote:
I was a very early (even in testing) user of SPF, It's rather commical
reading these FUD sayers about SPF and mailing lists, it has never been
a problem with mailing lists, not using mailman nor its more common
predecessor majordomo, and I've never noticed anything wrong with qmail
users ezmlm.
This establishes the context of SPF and mailing lists. Hence my question.
Also, the above text makes the incorrect assertion that this isn't a
problem when a message passes through a mailing list. However, SPF
breaks even with basic MTA relaying, nevermind mailing lists -- unless
the MTA is registered in the SPF record. The delivery/re-post behavior
of mailing lists not only breaks SPF but almost always also breaks DKIM.
(This latter point is what motivated ARC.)
If you have used some half baked concoction that doesn't conform to
standards that's not an SPF failure, it's yours. I've enforced and
published SPF since get go, I did extensive testing and never found ONE
instance of a list problem.
The reference to standards, here, does not have any obvious linkage to
well-known specifications. Hence my question.
As for forwarding, SPF is only a problem if you dont follow standards
and re-write.
Again, I've no idea what standards are being relied on here. Nor do I
believe there are any that are helpful to this issue. Hence my question.
Nearing two decades of SPF use (forget exactly its been so
long) never had a mailing problem sending or receiving with SPF and I've
always published hard fail, rarely forward Email, and it seems our
customers don't either.
This appears to rely on a single person's experience. Never a good
scientific method, except for that person's own use.
In any event, it is fully at odds with industry-wide reporting over
those decades. (It's also against the basic physics of the SPF design.)
d/
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