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Email Security Check

Check whether an email address sits on a properly protected domain and, when configured, whether Have I Been Pwned has breach signals for it.

Privacy note: Your email is used only for this check and is not stored. If Have I Been Pwned is enabled, only a SHA-1 hash prefix is sent to HIBP, not the full email address.

What this email security check does

The tool validates the email format, checks the domain's MX, SPF and DMARC records, flags common disposable or shared role addresses and, when a server-side HIBP key exists, checks breach exposure with Have I Been Pwned's k-anonymity API. API keys are never exposed to the browser.

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