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Re:Two billion email addresses were exposed by saintamh on Friday November 07, 2025 @03:05AM (#45844443)
Domain search is free. I never paid for HIBP and they give me a list of every address @my-domain that’s been leaked.

Edit: others are pointing out that it’s only free for domains with fewer than 10 pwned addresses. I have 8.

Re:Two billion email addresses were exposed by fencepost on Friday November 07, 2025 @05:05PM (#45851698)
The message I got wasn't related to the number of addresses affected (though I've been using this approach for a couple decades), but IIRC regarded whether the datasets in question were free.