Forum Discussion

Iron Contributor

Jan 23, 2019

Mail without TLS

I am getting some messages in my Office 365 about Mail without TLS. Is there any concerns here? Do I need to make any changes?

office 365

security

Tim Hunter

Iron Contributor

Jan 31, 2019

John Twohig VasilMichev ChrisWebbTech

Hi John,

I believe the devices that send may be too old. Does anyone know how to "drill down" on the 104 NO TLS messages to see where they are coming from so I can determine if it is possible to turn on TLS 1.2.

Thanks!

John Twohig

Iron Contributor

Jul 22, 2019

Tim Hunter

I know this is old but there is a report that shows the devices. I ran it this morning and it showed how many emails each printer/MFD sent last week.

https://techcommunity.microsoft.com/t5/Exchange-Team-Blog/Investigating-TLS-usage-for-SMTP-in-Exchange-Online/ba-p/609278

In the comments near the bottom there is one from Shawn Housler that shows how to get the report.

Tim Hunter
Iron Contributor
Jul 22, 2019

John Twohig
VasilMichev
ChrisWebbTech
@Shawn Housler

So I found the 1 email address in my account that is still apparently using TLS 1.0. It is an email we use for automated billing. How can I find out what device it is sending through using TLS 1.0, so I can upgrade that device to TLS 1.2? Thanks!
- John Twohig
  Iron Contributor
  Jul 22, 2019
  Tim Hunter
  
  Is it perhaps an application and not a device? I have a couple of applications that send automated emails. You may have to contact whoever wrote the software to see when they will upgrade it.
  
  I heard from one software vendor who got back to me with a link to an update. I did the update so I will check the TLS reports next week and hopefully that application will be gone.