Verify whether an email address is real and deliverable, live. Checks: syntax (RFC-shaped, typos like gmial.com), the domain's live MX records (can it receive mail at all), whether the domain is a known disposable/temporary provider (Mailinator, temp-mail, 10minutemail, ...), whether the local-part is a role/shared mailbox (info@, admin@, support@), whether it's a consumer free-webmail address, catch-all detection, and — when deep=true — a live SMTP RCPT-TO probe of the real mail server to confirm the specific MAILBOX exists WITHOUT sending any email. Returns a VALID / RISKY / INVALID verdict, a 0-100 deliverability score and explained reasons. Use this before adding an email to a list, accepting a signup, or sending mail you don't want to bounce.

Verify a batch of email addresses at once (e.g. a whole mailing list). Returns one verdict per address. Useful to clean a list before a campaign — flagging invalid, disposable, role-based and risky addresses that would bounce or hurt deliverability.