Outgoing PGP encryption with Exchange 2010

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http://serverfault.com – Is it possible to configure one Mailbox in Exchange 2010 to encrypt the outgoing mails with PGP? I have the following configuration: 1) External/Public SMTP-Relay (of course relay only for our domains) where all external Mail is sent to and forwarded to the public IP onsite and is also used as a smarthost for outgoing mail. This server runs MailEnable 6.7 Standard. 2) Sophos Astaro ASG110 with UTM 9 as a Firewall and SMTP-Spamfilter 3) Exchange 2010 onsite behind the firewall I have now one e-Mail address which receives PGP (or S/MIME) encrypted mails and should also be able to send them. I (HowTos)