Exchange Encryption

I want to encrypt email leaving our exchange server.  We run both 2003 and 2007.  Is there a way to send email encrypted to public email servers without user interverention.  Sorry this a very general quesiton.
etcorpAsked:
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Stephen CroftTechnical ArchitectCommented:
As a whole, no.

Exchange 2007 uses opportunistic TLS, meaning that if the mail server it is sending to supports TLS it will send encrypted.

Exchange 2003 doesn't, and forcing it to use TLS (SSL) will mean you cannot send to most mailservers (as most don't support SSL)

As a best practice, send via a secure Smart Host (Mimecast for example), and ask them to worry about it :)
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Stephen CroftTechnical ArchitectCommented:
Just re-read my last comment, and bawked. It's not technically a best practice, but the way I prefer to do things.

Forcing TLS will give you nothing but headaches, so let your 2k7 HT servers do the sending and let opportunistic TLS work its magic (or not as the case may be).
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