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Does Exchange SMTP or the SMTP connector support SSL?

Posted on 2008-02-11
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Does the Exchange SMTP connector only support TLS and not SSL? This has been said in news groups.

However, the Exchange 2003 Resource Kit uses the terms TLS/SSL interchangeable. For instance (p. 859): "Exchange servers and clients can use two encryption technologies that are based on certificates. These technologies are Transport Layer Security / Secure Sockets Layer (TLS / SSL) and S/MIME ..."
 
My understanding is that TLS 1.0/1.1 is built on SSL 3.0 and is supposed to offer a fall-back to SSL 3.0. The software -- in this case the SMTP connector - should negotiate TLS version 1 or SSL version 3
automatically (RFC 2246 "The TLS Protocol Version 1.0")

Never the less, TLS works fine with my Exchange and ISP, SSL with Outlook and my ISP, but no SSL with Exchange and my ISP.
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Question by:jonsmi
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SLafferty1983 earned 750 total points
ID: 20868985
I don't think you can use SSL for sending mail. I got this from http://support.microsoft.com/kb/829721 

TLS is designed to help protect outgoing messages, but TLS does not help protect traffic that travels from clients to the server. These clients include Microsoft Outlook Web Access (OWA), POP3, and IMAP4 in particular. To fix this problem, you can enable the use of Secure Sockets Layer (SSL) with Outlook Web Access. You can also suggest that POP3 or IMAP4 users use a client that supports the use of SSL with POP3 and IMAP4 (for example, Microsoft Outlook Express).

Also for more information see http://www.ietf.org/rfc/rfc2246.txt

Hope this helps.
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