EMail Encryption

We need to send confidential emails to our company offices abroad. Each office uses Microsoft Exchange (either 7 or 2000).

Emails sent internally e.g. from abc@mycompany.com to xyz@mycompany.com do not go out of our network. However, emails send overseas, for example, to abc@mycompany.co.uk are sent across the Internet.

Rather than installing the PGP Outlook add-in on each client PC is it possible to configure Exchange to encrypt all emails sent to specific domain addresses e.g. mycompany.co.uk, mycompany.fr. And of course, the decrypting at the recipient's Exchange server.

What if one of our overseas offices decides not to use Micrsoft Exchange; are there any other solutions?

Thanks.
BSewillsAsked:
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JasonBighamCommented:
Recieved an email from a vendor yesterday dealing with just this. They used http://www.zixcorp.com/compro/ to send me the email. Particularly, the ZixMail (I am not a customer) product. This would allow for your last question, or some other similiar product. I imagine they have competitors.
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gmorgan101Commented:
The easiest and simplest solution to send emails encrypted is to use VSN Encrypt Managed Service. http://vsn.visus-it.com.
This service uses your Email address as your Public Key and unlike PKI systems you do not require the messing around with certificates. To send an encrypted email you are given 2 options, yo can either download the Outloo/Outlook Express plugin which gives you  a send secure button which will encrypt your email to an encryption equivalent standard of RSA 1024bit or you can use the Zero Download Manager Web Interface to send the email encrypted. The end user then has the choice to view the encrypted email through their Internet Browser or they can download the Outlook plugin to view it seemlessly within thir email client. The solution is simple and cheap with no administration overhead. A breath of fresh air!!
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