On Sun, 23 Oct 2011 23:42:54 +0200, Gregor Zattler <telegraph@gmx.net> wrote:
> Obviously I miss something here?  There are already Received:-Headers in
> emails which contain the date when the mail was received.  How do I
> search on arbitrary headers?  This is especially difficult since date
> specifications are so complex.

Unfortunately, notmuch doesn't index all headers at the moment (only
From, To, Cc, etc.), so I don't think this is currently possible. It has
been on the TODO list[1] for a long time though.

[1] http://notmuchmail.org/feature-requests/

Cheers,
Daniel