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 18,350,682 websites that are Office 365 Mail Customers. We know of 14,468,192 live websites using Office 365 Mail and an additional 3,882,490 sites that used Office 365 Mail historically and 2,456,256 websites in the United States.
Office 365 Mail websites that are also using other technologies.
Get a list of 18,350,682 websites using Office 365 Mail which includes location information, hosting data, contact details, 14,468,192 currently live websites and an additional 2,508,727 domains that redirect to sites in this list. 3,882,490 sites that used this technology previouslyand 2,456,256 websites in the United States currently using Office 365 Mail.
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