We have been having a lot of discussion as to the use case for policy.
One use case that clearly provides real and immediate benefit is for filtering
mailing lists:
AXIOM: Mailing lists do not subscribe to other mailing lists
CONSEQUENCE: Any mail that fails verification on receipt by a list serv is
either bogus or was sent by a misconfigured server
I think that we get a very clear benefit here. Filtering out spam is a major
headache on a mailing list. Although mail sent by non subscribers can often be
dumped it sometimes has to be moderated and that is a real pain.
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