Clean a CSV or table of email addresses into keep / risky / remove segments with
per-row evidence — free deterministic passes first (dedupe, syntax, role and
disposable screens, domain MX check), then a paid mailbox validator only on rows
that survive. Use whenever someone says: clean this email list, scrub my list
before a send, remove invalid or duplicate emails from this CSV, how many of
these addresses are still good, or prep this list for cold outreach. Every
removed row ships with its reason — nothing is silently deleted, and rows that
can't be verified are flagged, never guessed. Do NOT use it to check one or two
addresses (verify-email-deliverability), to find or …
