Checks one email address at a time (this free data source has a shared usage limit across all visitors to this site).
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We only send your email address to our breach-data provider to run this one check - it isn't logged or stored by us beyond a short, automatic cache (about 15 minutes) used to avoid re-querying the same address. Results only ever show breach names, dates, and categories of exposed data - never actual passwords or other stolen records.