On Wed,  1 Dec 2010 21:33:55 +0100, Joel Borggrén-Franck <joel.borggren.franck@gmail.com> wrote:
> From: Joel Borggrén-Franck <jbf@codehouse.se>
> 
> Add headers cc: bcc: and to: to index. Real header to: is searched as
> "exactto:foo@bar.baz" and search term "to:" is kept as a union of cc:,
> bcc: and to: for backward compatibility. Use search term "cc:" resp.
> "bcc:" to search those headers respectively.

cworth has been talking for a while about changing notmuch to index all
of the headers - this is one of my key missing features at this point. 
Searching for Sender: or X-Mailing-List: or (PLEASE!!!!) X-Spam-Score:

/D