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 15,522,705 websites Office 365 Mail Customers. We know of 12,199,911 live websites using Office 365 Mail and an additional 3,322,794 sites that used Office 365 Mail historically and 2,263,740 websites in the United States.
Office 365 Mail websites that are also using other technologies.
Get a list of 15,522,705 websites using Office 365 Mail which includes location information, hosting data, contact details, 12,199,911 currently live websites and an additional 1,847,299 domains that redirect to sites in this list. 3,322,794 sites that used this technology previouslyand 2,263,740 websites in the United States currently using Office 365 Mail.
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