EmailKnow uses one-way IP hashing to filter self-opens without storing personal data

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EmailKnow developer identified a common tracking flaw where senders inflate their own open-rate stats by previewing sent emails. To fix this without storing raw IP addresses, the developer hashes the sender's IP using SHA-256 with a secret salt at send time. When a tracking pixel fires, the opener's IP is hashed the same way and compared against the stored value. A match flags the open as a self-open and excludes it from real open counts, while a non-match confirms a genuine recipient. The approach stores only a hash that cannot be reversed, answering a single yes-or-no question without retaining any personally identifiable location data.

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