How would I know if an e-mail originates from Office 365

How would I know if an e-mail originates from Office 365?

I know I can look at the oldest Received header of a message to see where it originates from, but how would I use that header value to know it was sent from an Office 365 account?

It looks like the TLD exchangelabs.com is a candidate, but I'd like to know for sure.

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