+Sending Mail
+------------
+
+:index:`mail-user-agent`
+
+ Emacs consults the variable :ref:`mail-user-agent` to choose a mail
+ sending package for commands like :ref:`report-emacs-bug` and
+ :ref:`compose-mail`. To use ``notmuch`` for this, customize this
+ variable to the symbol :ref:`notmuch-user-agent`.
+