In <42E310B2(_dot_)7CDD(_at_)xyzzy(_dot_)claranet(_dot_)de> Frank Ellermann
Do I have it backwards?
Yes, you started with From, then Sender, then Resent-crap.
Normally 1-2-3-4 should be the same as your !4-!3-!2-!1.
That is what the word "unless" was in my description for.
This is part of why the PRA is so confusing. *Most* of the time, the
PRA will be the same as the From: header. This is what people are
most likely to think in terms of.