Email Validator Kit — CSV List Hygiene, Three-State Flag-Only Checks

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Description

Flag-only CSV hygiene for email lists: syntax, disposable-domain, and MX checks reported as valid/invalid/unknown per row, with duplicates flagged and never deleted. Needs dnspython, pydantic, requests (not vendored). If the disposable list or DNS lookup fails, results report unknown, never assumed valid. Live MX checks were not verified end-to-end in the build sandbox (DNS blocked); disposable list fetched live. Sample data is fictional. No outcome is promised.