-C-c C-x a enclose as multipart/alternative.
-C-c C-x p enclose as multipart/parallel.
-C-c C-x m enclose as multipart/mixed.
-C-c C-x d enclose as multipart/digest.
-C-c C-x s enclose as PGP signed.
-C-c C-x e enclose as PGP encrypted.
+C-c C-m C-a enclose as multipart/alternative.
+C-c C-m C-p enclose as multipart/parallel.
+C-c C-m C-m enclose as multipart/mixed.
+C-c C-m C-d enclose as multipart/digest.
+C-c C-m C-s enclose as PGP signed.
+C-c C-m C-e enclose as PGP encrypted.