(main): Register all mailbox/mailer formats.

 /* GNU Mailutils -- a suite of utilities for electronic mail
    Copyright (C) 1999, 2000, 2001, 2002, 2003, 
-   2005 Free Software Foundation, Inc.
+   2005, 2006 Free Software Foundation, Inc.
 
    GNU Mailutils is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -361,6 +361,8 @@ main (int argc, char *argv[])
   mu_tls_init_client_argp ();
 #endif
   mu_sieve_argp_init ();
+  mu_register_all_formats ();
+  
   rc = mu_argp_parse (&argp, &argc, &argv, ARGP_IN_ORDER, sieve_argp_capa,
 		      0, &opts);