Vouch

Vouch is a real-time email verification API that confirms whether an address can actually receive mail — before you ever hit send. Every lookup runs the full deliverability pipeline: format and domain checks, live MX resolution, and a real SMTP conversation with the recipient's mail server to confirm the mailbox exists. Results come back typically in a few hundred milliseconds, and Vouch never sends an actual email to get them.

One call, one clear verdict — keep it, drop it, or flag it — backed by a 0–100 deliverability score.

What every check covers

• Syntax & domain — validates the address and confirms the domain publishes mail (MX) records.
• Live mailbox probe — opens a real SMTP connection and issues a RCPT TO to confirm the inbox accepts mail, without delivering anything.
• Catch-all detection — flags domains that accept every address, so you know when a "valid" result is really inconclusive.
• Disposable, role & free — flags throwaway domains, role inboxes like info@ or support@, and free providers.
• Did-you-mean — catches likely typos such as gmial.com and suggests the address the user actually meant.

What you get back

Each response carries a single status — deliverable, undeliverable, risky, or unknown — alongside a specific reason code, a 0–100 score, the individual check results, and quality flags. No guesswork: one field tells you whether to send, skip, or treat the address with caution.

Where teams use it

• At signup — verify addresses right on the form so typos and junk never reach your database.
• Before a campaign — clean your list to cut bounces and protect your sender reputation.
• Across your CRM — score and segment existing contacts by how deliverable they really are.

Simple to integrate

A single authenticated endpoint — GET /v1/[email protected] with your API key — returns clean JSON you can act on immediately. Verification runs on pre-paid credit packs: one credit per check, no subscription, and you're only charged for checks Vouch completes. Choose a credit pack to get your API key and start verifying in minutes.