It seems that hotmail.com mail server sitting at hotmail-com.olc.protection.outlook.com is using a TLS certificate issued to mail.protection.outlook.com.

Both the mail server hostname and TLS certificate common name belong to the same subdomain: protection.outlook.com

I'm trying to understand what's happening. Am I expected to ignore this kind of name mismatch?

This report seems to point out that there's something wrong:

hotmail.com TLS report

Edit 2018-08-04

Report link: https://ssl-tools.net/mailservers/hotmail.com

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