(Creating a bug report from a mail thread on emacs-devel to keep it
alive.  I probably should have done this as a bug report originally.
Original thread on http://permalink.gmane.org/gmane.emacs.devel/175920)

I wrote:
> Earlier today I was bitten by something that has irritated be before as
> well.  When reporting bugs from an "emacs -Q", emacs doesn't know my
> email address.  No problem, I can edit the From: header.
>
> However, I like to use my local sendmail as transport, because I have
> already told that how and where to forward my mail, and it seems like a
> perfectly good option.  But message.el then decides to make up its own
> envelope-from, regardless of From: header.  That makes the mail bounce.
>
> Attached is a patch to emacsbug.el that checks if what message.el would
> do results in a bogus address, and if so, defaults to the From: header
> instead.