(auto-)tagging sent messages

[Tom Prince]

> > Further, for certain mails I sent (like this one ) I would like a
> > WAITING tag (or similar) in order to indicate that I am waiting for an
> > answer. Currently I set this manually. Could this be achieved through
> > some indicators via message mode or similar means? e.g.:
> > 
> > <#notmuch tag=WAITING> analog to <#secure method=pgpmime mode=sign>
> 
> No idea how this works since I don't follow Jameson's crypto branch,
> but it's probably not a good idea for this use case since (I presume)
> the indicator will become permanently lodged in the content of the
> mail, which isn't where highly volatile metadata belongs.

I think the idea isn't to save it in the message, but to postprocess the
message when sending, remove the marker and add the tag instead.

  Tom