Keith Moore writes:
There really is a conflict sometimes between what the sender thinks
should happen in the event of a reply and what the recipient wants to
happen with the reply he composes. In that circumstance, the recipient
needs to win.
Time for a reality check.
If the sender wants some addresses to not receive followups, he can send
blind carbon copies to those addresses. The public recipient is given no
hint of those addresses.
How is the recipient supposed to ``win''? Is his MUA supposed to spy on
the sender's computer and see where the message was actually sent?
Similarly, in the unusual case that the sender wants followups going to
more places than his own message, he can put those addresses into To or
Cc without actually sending the message there. Once again: How is the
recipient supposed to ``win''?
Blaming Mail-Followup-To for this is silly. There's no Mail-Followup-To
in these examples. There's no way for the Internet mail system to stop
the sender from putting some addresses into the header and other
addresses into envelopes.
---D. J. Bernstein, Associate Professor, Department of Mathematics,
Statistics, and Computer Science, University of Illinois at Chicago