Swiss based secure email hosting.
https://protonmail.ch
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Get access to data on 268,762 websites ProtonMail Customers. We know of 213,361 live websites using ProtonMail and an additional 55,401 sites that used ProtonMail historically and 114,296 websites in the United States.
Get a list of 268,762 websites using ProtonMail which includes location information, hosting data, contact details, 213,361 currently live websites and an additional 70,577 domains that redirect to sites in this list. 55,401 sites that used this technology previouslyand 114,296 websites in the United States currently using ProtonMail.
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These are sites that we think might use ProtonMail in the future because of their similarity to other sites that already do.