[Webinar] Streamline your web hosting managementRegister Today


Does Exchange SMTP or the SMTP connector support SSL?

Posted on 2008-02-11
Medium Priority
Last Modified: 2013-11-30
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.
Question by:jonsmi
1 Comment

Accepted Solution

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.

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article, I will demonstrate that how to do a PST migration from Exchange Server to Office 365. This method allows importing one single PST, or multiple PST's at once.
In this post, we will learn to set up the Group Naming policy and will see how it is going to impact the Display Name and the Email addresses of the Group.
how to add IIS SMTP to handle application/Scanner relays into office 365.
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the adminiā€¦
Suggested Courses

607 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question