Jan 23 2019 11:35 AM
Jan 23 2019 12:49 PM
Jan 23 2019 01:26 PM
Jan 24 2019 12:57 AM
Switch to using the other option, "By verifying that the subject name on the certificate that the sending server uses to authenticate with Office 365 matches this domain name". Details for example here: https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/use-connectors-to-configure-mail-...
You can also toggle the RequireTls parameter.
Jan 31 2019 09:22 AM
I have been wondering the same thing but none of the answers here make sense to me.
In our case, and it looks like yours as well, the connector exists to allow printers, scanners, software, and other devices to send email using an unauthenticated smtp connection to Office 365. What appears to me to be happening is that some of those devices are sending email without using TLS 1.2. I assume that is either because the devices are unable to (Too old or need updates) or they are able too but TLS 1.2 is not enabled on those devices.
I thought that the solution was to find those devices and update them and enable TLS 1.2 if possible. However, I haven't been able to find a way to identify where the emails are coming from. In your case if you could drill down on the 104 NO TLS messages to see where they come from you could quickly determine whether they could be updated to send TLS 1.2 and get rid of the warnings. If someone knows how to do that please tell.
Or maybe I have completely misunderstood what is going on ...
Jan 31 2019 09:25 AM
Jul 22 2019 10:40 AM
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.
In the comments near the bottom there is one from @Shawn Housler that shows how to get the report.
Jul 22 2019 11:09 AM
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!
Jul 22 2019 02:22 PM
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.