Is my PKI a subordinate CA?

I need to set up TLS on my Exchange server. The technet article example uses an internal CA which is a subordinate CA.
I have an internal CA but I'm not sure if it is a subordinate CA. How do I tell if it is?
Also, Do I need a subordinate CA or can I just use a third party cert for the TLS on the edge servers?
Brian GowdeyNetwork AdministratorAsked:
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IvanSystem EngineerCommented:

you dont need a sub CA for that. You can use either Root CA or third party CA.
When you open any cert issued by your CA, and go to properties, Certification Path, you can see if your CA is root or sub.

David Johnson, CD, MVPOwnerCommented:
open any certificate issued by that CA and check the certificate chain and you will know
Brian GowdeyNetwork AdministratorAuthor Commented:
Ah! So it appears I already have a third party cert on my SMTP services. We must have set that up when we were doing O365 hybrid.
My default receiveconnector shows TLS is checked off but not the Enable Domain Security (multi auth TLS). Our send connector doen't appear to have Enbale Domain Security (Mutual Auth TLS) configured.

Our goal was to be able to use TLS between our bank and the company but why not just enable it on the internet connectors?
Would that stop non-encrypted connections in the future?
Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

-- Ivan (https:#a42427288)
-- David Johnson CD MVP (https:#a42427334)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

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