Have I Been PwnedHave I Been Pwned

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Domain ownership verification for haveibeenpwned provides site owners with access to reports of email addresses associated with there domain found in data breaches.

Email Hosting Providers

Google Apps for BusinessGoogle Apps for Business

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Web-based email, calendar, and documents for teams. Renamed to Google Apps for Work, but now known as G Suite from Google Cloud.

Business Email Hosting

SPFSPF

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The Sender Policy Framework is an open standard specifying a technical method to prevent sender address forgery.

Operating Systems and Servers
Verified CDN

Amazon S3 CDNAmazon S3 CDN

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Amazon S3 is storage for the Internet. It is designed to make web-scale computing easier for developers.