Who Knows My Email
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Email scan FAQ

Frequently asked questions

Clear answers about using Who Knows My Email, verifying your email address, reading scan results and keeping your result private.

Can I scan any email address?

No. This service is intended for your own email address, or for an address you have explicit permission to check.

Why does a scan take a little while?

We check multiple websites step by step. Some websites respond faster than others, so progress is shown during the scan.

What will I see in the result?

You only see websites where your email address appears to be registered. Treat the result as a clear indication, not legal proof.

Why is a result described as appears registered?

Websites regularly change their technical checks. Results should therefore be treated as a strong indication, not legal proof.

Is the scan really free?

Yes. The public email scan is free. You do not need to pay to view the results. If a PDF report is available, it can be downloaded after the scan.

Why do I need to verify my email?

Verification helps make sure the person requesting the scan can access the mailbox. This reduces misuse and keeps the tool focused on checking your own address.

What is a breach signal?

A breach signal means the email address may appear in a known exposure source, leak dataset, reputation source or related public indicator. Treat it as a prompt to review important accounts.

What are username signals?

The scanner may check the part before the @ against public profile signals. Username matches can be useful, but they are signals, not proof, and may include false positives.

Are adult sources included?

Adult sources are optional and can be switched on by the visitor when this feature is available. They are sensitive, so only use them for your own address.

What should I do after a result?

Review unfamiliar registrations, close old accounts, change reused passwords and enable two-factor authentication on important services.