The mail buffer is an ordinary Emacs buffer, so you can switch to
other buffers while composing the mail. If you want to send another
-mail before sending the current one, type @kbd{C-x m} again, and Emacs
-will switch back to the last mail buffer and ask if you want to erase
-the message in that buffer; answer yes to discard the unsent message
-and start composing a new one. If you know that you'd like to
-continue composing an unsent message, invoke this command with a
-prefix argument, @w{@kbd{C-u C-x m}}, and Emacs will switch to the
-last mail buffer and let you pick up editing the message where you
-left off.
+message before finishing the current one, type @kbd{C-x m} again to
+open a new mail buffer whose name has a different numeric suffix
+(@pxref{Misc Buffer}). (This only works if you use the default
+Message mode to compose email; see @ref{Mail Commands}.) If you know
+that you'd like to continue composing the unsent message you were
+editing, invoke this command with a prefix argument, @w{@kbd{C-u C-x
+m}}, and Emacs will switch to the last mail buffer you used and let
+you pick up editing the message where you left off.
@kindex C-x 4 m
@findex compose-mail-other-window