🚀 go-pugleaf

Christian suggests:

> 1) Do not place any "ReSent-From" or "ReSent-Sender" in the header. The info
> is in the envelop, and that should be enough.

Ah, but the envelope is NOT what should be used if it reflects the
re-sender, "mailmod".  Also, there is NO way in RFC 822 to avoid
ReSent-From or ReSent-Sender, although there may be tricky ways to
bypass the automatic additions of these components by the posting
agent -- something I'd prefer to avoid, but not completely unwilling
to try if necessary.

> 2) If you place a "Resent-From", then cook-up a "Reply-To" field from the
> original "From/Sender" field -- and do it carefully, so as to avoid multiple
> entries to same list...

Cooking up a Reply-To component sounds not unreasonable.  Anybody know
if Reply-To (or to whatever X.400 component it gets mapped) takes
precedence?