Email sent from this domain has records showing Office 365 usage.
https://products.office.com/en-us/business/office
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Get access to data on 17,692,110 websites Office 365 Mail Customers. We know of 14,469,130 live websites using Office 365 Mail and an additional 3,222,980 sites that used Office 365 Mail historically and 2,461,586 websites in the United States.
Office 365 Mail websites that are also using other technologies.
Get a list of 17,692,110 websites using Office 365 Mail which includes location information, hosting data, contact details, 14,469,130 currently live websites and an additional 2,487,151 domains that redirect to sites in this list. 3,222,980 sites that used this technology previouslyand 2,461,586 websites in the United States currently using Office 365 Mail.
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