+(defcustom notmuch-identities nil
+ "Identities that can be used as the From: address when composing a new message.
+
+If this variable is left unset, then a list will be constructed from the
+name and addresses configured in the notmuch configuration file."
+ :type '(repeat string)
+ :group 'notmuch-send)
+
+(defcustom notmuch-always-prompt-for-sender nil
+ "Always prompt for the From: address when composing or forwarding a message.
+
+This is not taken into account when replying to a message, because in that case
+the From: header is already filled in by notmuch."
+ :type 'boolean
+ :group 'notmuch-send)
+