b) was it sent to the mailing list by the purported "From"?"
Why would anyone care about b?
Well, as an example, a message saying: ...
would have a very different meaning coming from me than from Jim Fenton.
Who is saying something is quite often relevant.
How is it relevant to DKIM or SSP? For filtering purposes, if a
message is from the list, it's from the list.
R's,
John
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