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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.

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DomainKeys Identified Mail provides a method for validating a domain name identity that is associated with a message through cryptographic authentication.

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

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UK based domain name registration, SSL, VPS and hosting services. Part of WebFusion.

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