Solved

Exchange Smarthost TLS Encryption 256 Bit

Posted on 2015-01-28
6
323 Views
Last Modified: 2015-03-16
Hi experts,

we are using a smarthost in Excange2010 to send e-mails to the internet. In exchange we have a rule that all mails (*) will be send with that send-connector.
Does Exchange per default use TLS for sending mails outside if the receiving server offers TLS?
What encryption can Exchange use to send (128Bit, 256Bit). In outgoing mail I see that exchange is sending with 128 Bit. Is it possible  to set it to 256 Bit?

Another question is, how it would be possible to force exchange or the smarthost to send mails to *@test.com always via a specified mx-server?

Many thanks in advance!
0
Comment
Question by:Systemadministration
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
6 Comments
 
LVL 4

Expert Comment

by:Alexander Kireev
ID: 40575945
Hello.

Does Exchange per default use TLS for sending mails outside if the receiving server offers TLS?
No. You need to enable TLS for send and receive connectors.
https://technet.microsoft.com/en-us/library/bb123543%28v=exchg.141%29.aspx

What encryption can Exchange use to send (128Bit, 256Bit). In outgoing mail I see that exchange is sending with 128 Bit. Is it possible  to set it to 256 Bit?
I think Yes. Reed this topic: https://social.technet.microsoft.com/Forums/office/en-US/5830c533-38eb-4d88-92fe-6e1a02d7bac4/change-block-size-from-aes128-to-aes256-in-exchange-2007-for-forced-tls-to-an-external-receipient?forum=exchangesvrgenerallegacy

Another question is, how it would be possible to force exchange or the smarthost to send mails to *@test.com always via a specified mx-server?
MX-server you mean specific MX records of external domain? Maybe easier way is use IP-addresses of those MX-servers in new send connector?
0
 

Author Comment

by:Systemadministration
ID: 40576919
OK, I think all of your suggestions mean that I have to configure "Mutual TLS", right?
And for mutual TLS I have to publish my Exchange server to the internet, right?
What if I`d like to use a smarthost (of a provider) for outgoing mail and external mailboxes for receiving mails (with a fetching connector on exchange)? Would I be able to implement that Mutual TLS or 256Bit encryption?
0
 
LVL 4

Accepted Solution

by:
Alexander Kireev earned 500 total points
ID: 40578255
OK, I think all of your suggestions mean that I have to configure "Mutual TLS", right?
Yes.

And for mutual TLS I have to publish my Exchange server to the internet, right?
I propose you to publish only Edge server. If you don't have the Edge use sarthost.

What if I`d like to use a smarthost (of a provider) for outgoing mail and external mailboxes for receiving mails (with a fetching connector on exchange)?
Ask you provider - does smart host use TLS, AntiSpam and AntiVirus filter.

Would I be able to implement that Mutual TLS or 256Bit encryption?
I think Yes. I'm not expert on security.
Good arcitles and forum:
https://social.technet.microsoft.com/Forums/forefront/en-US/ec033ff6-091d-441d-8ad3-7ea411100009/ssl-with-256bit-strength
http://www.derekseaman.com/2010/06/enable-tls-12-aes-256-and-sha-256-in.html
0
Salesforce Has Never Been Easier

Improve and reinforce salesforce training & adoption using WalkMe's digital adoption platform. Start saving on costly employee training by creating fast intuitive Walk-Thrus for Salesforce. Claim your Free Account Now

 
LVL 4

Expert Comment

by:Alexander Kireev
ID: 40594284
Hello,
Did you do TLS with 256bit?
Did the articles help you?
0
 

Author Comment

by:Systemadministration
ID: 40633262
No I didn`t
If I do, I`ll let you know.
0
 

Author Comment

by:Systemadministration
ID: 40669025
0

Featured Post

Comparison of Amazon Drive, Google Drive, OneDrive

What is Best for Backup: Amazon Drive, Google Drive or MS OneDrive? In this free whitepaper we look at their performance, pricing, and platform availability to help you decide which cloud drive is right for your situation. Download and read the results of our testing for free!

Question has a verified solution.

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

Scam emails are a huge burden for many businesses. Spotting one is not always easy. Follow our tips to identify if an email you receive is a scam.
Check out this step-by-step guide for using the newly updated Experts Exchange mobile app—released on May 30.
The video tutorial explains the basics of the Exchange server Database Availability groups. The components of this video include: 1. Automatic Failover 2. Failover Clustering 3. Active Manager
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 admini…

717 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