On Sat, 28 Nov 2009 17:05:06 +0100, Jed Brown <jed@59A2.org> wrote:
> First, I'm aware that such munging is A Bad Thing
> 
>   http://www.unicom.com/pw/reply-to-harmful.html

Definitely.

>   From: Some User <some.user@example.com>
>   To: Sample users list <sample-users@sample.org>
>   Reply-To: Sample users list <sample-users@sample.org>
>   
> Notmuch reply produces
> 
>   To: Sample users list <sample-users@sample.org>,
>       Sample users list <sample-users@sample.org>
> 
> Handling this is a bit messy, I think we want the current behavior
> unless To matches Reply-To, in which case we use From and Reply-To.  If
> this is indeed the least bad behavior, I will make a patch for it.

Oh, I really like that. The condition there avoids breaking legitimate
uses of Reply-To, (such as the cairo lists I run, where cairo-commit@
has no user-generated From:---just a single automated address, but has
Reply-To: set to the cairo@ list instead so that replies to committed
patches go to the right place).

-Carl