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message: PGP Compatibility

 
 2.7.5 Compatibility with older implementations
 ----------------------------------------------
 
 Note, if you are using the ‘gpg.el’ you must make sure that the
 directory specified by ‘gpg-temp-directory’ have permissions 0700.
 
    Creating your own key is described in detail in the documentation of
 your PGP implementation, so we refer to it.
 
    If you have imported your old PGP 2.x key into GnuPG, and want to
 send signed and encrypted messages to your fellow PGP 2.x users, you’ll
 discover that the receiver cannot understand what you send.  One
 solution is to use PGP 2.x instead (e.g., if you use ‘pgg’, set
 ‘pgg-default-scheme’ to ‘pgp’).  You could also convince your fellow PGP
 2.x users to convert to GnuPG.  As a final workaround, you can make the
 sign and encryption work in two steps; separately sign, then encrypt a
 message.  If you would like to change this behavior you can customize
 the ‘mml-signencrypt-style-alist’ variable.  For example:
 
      (setq mml-signencrypt-style-alist '(("smime" separate)
                                          ("pgp" separate)
                                          ("pgpauto" separate)
                                          ("pgpmime" separate)))
 
    This causes to sign and encrypt in two passes, thus generating a
 message that can be understood by PGP version 2.
 
    (Refer to <http://www.gnupg.org/gph/en/pgp2x.html> for more
 information about the problem.)
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