How do I enable TLS for all outgoing messages in Exchange 2003? What if the recipient server doesn't have TLS enabled?

With Exchange 2003 it is an all or nothing affair. If you enable it for all email, then probably 90% of your email will fail to be delivered - most recipient servers do not support TLS. Exchange 2003 doesn't do opportunist TLS. If you want to use opportunist TLS, then you need to upgrade to Exchange 2007 or higher. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources

To answer your specific question, it would be set on an SMTP connector, but it is best set on a per domain basis. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources

What about the KB article 329061 http://support.microsoft.com/kb/329061/en-us? Is this a work around?

Hi, Here is some more useful information for you, Implementing TLS between two Exchange server organizations: http://msexchangeteam.com/archive/2006/10/04/429090.aspx Best regards, Serena Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.