NAME

       gpgmailtunl - Encrypts an email message into the body of another email.

SYNOPSIS

       gpgmailtunl [options] --encrypt | --decrypt

DESCRIPTION

       gpgmailtunl is a filter program that either encrypts an email message using the Gnu
       Privacy Guard and sends it to another recipient or decrypt an email message and forwards
       unencrypted to another destination.

       It can be used to exchange emails across an open network betweeen two trusted systems.

TYPICAL USAGE

       This program is intended to run from program like procmail or sendmail to create an email
       tunnel between two systems.  Of course this is not as secure as using gpg as an end user
       program, it may be convenient in certain case.

ENCRYPTION

       To encapsulates an email within another you pipe the message to gpgmailtunl.

   OPTIONS
       GetOptions( \%opt, "encrypt", "decrypt", "sign", "secret-file=s",          "from=s",
       "to=s", "subject=s", "homedir=s", "local-user=s",          "recipient=s",        )
         or usage;

       to  This is the address to which the encrypted message will be sent. This is the only
           required fields.

       recipient
           This sets the keyid that will be used to encrypt the outgoing message.  If unset,
           gpgmailtunl will try to find a key matching the to option.

       subject
           Sets the subject of the outgoing message. This defaults to "Encrypted mail".

       from
           Sets the From header line of the outgoing message which will contains the encrypted
           one. sendmail will provides a default one if this is not set.

       sign
           If this option is used, the outgoing message will be signed. In this case you should
           probably use to local-user and secret-file options.

       secret-file
           File from which the secret to unlock the private used to sign the message can be read.

       local-user
           The keyid of the user that should sign the outgoing message. The default user will be
           used if not specified.

       homedir
           Sets an alternate gpg home directory. (This is where the keyrings are stored.)

DECRYPTION

       To extract an email to be forwarded to the final user you pipe the encrypted email to
       gpgmailtunl using the decrypt switch.

       Once decrypted, the encapsulated email message will be sent to the original destinator of
       the message.

   OPTIONS
       homedir
           Sets an alternate gpg home directory. (This is where the keyrings are stored.)

       secret-file
           File from which the secret to unlock the private used to decrypt the message can be
           read.

AUTHOR

       Francis J. Lacoste <francis.lacoste@iNsu.COM>

COPYRIGHT

       Copyright (c) 1999, 2000 iNsu Innovations Inc.

       This program is free software; you can redistribute it and/or modify it under the terms of
       the GNU General Public License as published by the Free Software Foundation; either
       version 2 of the License, or (at your option) any later version.

SEE ALSO

       gpg(1) gpgmailtunl(1) GnuPG(3)