David Wen Riccardi-Zhu <dwrz@dwrz.net> writes:

When I run a search with notmuch (on Emacs), olders email are shown first
(at the top of the screen). This is inconvenient, since the majority of
my searches relate to more recent emails. Is there a way to flip the
output around, so that newer mails appear first?

Check out the variable notmuch-search-oldest-first. I have this set in
my notmuch-config:

   (setq notmuch-search-oldest-first t)

you should have

   (setq notmuch-search-oldest-first nil)

I guess. Also, in a notmuch-search buffer, the effect of pressing o for
me is to toggle the search order. C-h k o

   o runs the command notmuch-search-toggle-order, which is an
   interactive compiled Lisp function in `notmuch.el'.

   It is bound to o.

   (notmuch-search-toggle-order)

   Toggle the current search order.