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 15,316,522 websites that are Office 365 Mail Customers. We know of 12,725,281 live websites using Office 365 Mail and an additional 2,591,241 sites that used Office 365 Mail historically and 2,292,593 websites in the United States.
Office 365 Mail websites that are also using other technologies.
Get a list of 15,316,522 websites using Office 365 Mail which includes location information, hosting data, contact details, 12,725,281 currently live websites and an additional 1,876,651 domains that redirect to sites in this list. 2,591,241 sites that used this technology previously and 2,292,593 websites in the United States currently using Office 365 Mail.
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