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](https://i.stack.imgur.com/Fybn1.png)](https://i.stack.imgur.com/Fybn1.png)

**Edit 2018-08-04**

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