🚀 go-pugleaf

Elm's Filter program can be used to forward messages.  When used in such a
way, filter transforms the following header:

	From uwspan!uwvax!puff.cs.wisc.edu!jeff
	Date: some date
	From: jeff@puff.cs.wisc.edu (Jeff Public)
	Subject: something
	To: plocher@hobbes.uucp

into
	Subject: "something"
	From: Filter of plocher@hobbes <plocher>
	To: newperson@newmachine
	X-Filtered-by: Filter version xxx

As I read RFC822 it *should* be doing this instead:
	
	Date: some date
	Resent-Date: date forwarded
	From: jeff@puff.cs.wisc.edu (Jeff Public)
	Resent-From: plocher@uwspan
	Resent-Sender: Filter program used by John Plocher <plocher@uwspan>
	Subject: something
	To: plocher@hobbes.uucp
	Resent-To: newperson@newmachine


The questions:
	Do I understand things OK?

	Is the current Filter behavior correct?

	What will break if I try to use the Resent- fields as shown in
	the last example? 

	What is the answer to life, the universe, and everything?

-John

ps.  Don't bother answering the last one - I know what the answer to *that* one
is cuz my digital watch told it to me :-)