Exchange Server 5.5 SMTP SSL

It does allow SSL for smtp. I have it setup that way on our dmz server. When you are adding the SSL certificate to IIS, enable it on SMTP port 25. You then need to have your POP3/IMAP4 users set their profiles to use SSL SMTP. Goto Accounts->properties of the mail account-> advanced tab Server Port numbers, click this server requires a secure connection (SSL). Hope this helps.