On 2010-04-10, Carl Worth wrote: > So I propose something like: > > User-Agent: Notmuch/0.2 (http://notmuchmail.org) Emacs/23.1.1 (gnu/linux) That looks good to me. So I assume the correct strategy here would be to: 1) have notmuch reply insert a header: User-Agent: Notmuch/0.2 (http://notmuchmail.org) 2) have notmuch-reply.el (or whatever) add a setup mail hook that searches for an existing User-Agent header and appends " Emacs/23.1.1 (gnu/linux)" One issue is again, such a hook would be message mode specific, so gnus users might not appreciate that. Also when composing a message via c-x m this would not work. So perhaps an all lisp solution? Again, can we hijack message mode to add our own promotion header? Or has the time come for a notmuch-message-mode that somehow inherits from message mode? bremner said something about dynamic bindings that would allow that. Sebastian