"Andrew A. Raines" <drew@poured.net> writes:

> How did earlier Gnuses handle this issue?  

Basically the same way as now: It passes the envelope sender to sendmail
with '-f' on the command line.

If `message-sendmail-envelope-from' is nil (the default), nothing should
have changed -- it'll use `message-make-address' in the envelope.

> It seems like this only started recently.  

I don't see how `message-sendmail-envelope-from' could make anything
different with the default setting.  But you could try this patch and
see if it changes anything: