Deliverability and infrastructure

Email verification

Definition

Email verification checks whether an address exists and can receive mail, without sending to it, so invalid addresses are removed before a campaign.

Email verification in practice

Verifiers check the syntax, look up the domain's MX records, then talk to the mail server to ask whether the mailbox exists, stopping before a message is sent. The result is usually valid, invalid, risky or unknown.

Catch-all domains accept mail for any address, so a verifier cannot confirm the person behind them. Decide up front how you treat catch-all results, for example a separate low volume send, rather than mixing them into the main sequence and hoping.

Bounce rateWaterfall enrichmentMX recordCost per verified contactEmail verification
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Last updated 2026-10-14 by Ishan Vats.

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Free 30 minute signal audit

See where email verification fits in a real build.

Book the free 30 minute signal audit. We map the buying signals for your ICP live on the call, and show you where email verification sits in the system we would build.

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  1. 01You talk. Who you sell to and what you send today.
  2. 02We map. The signals that fire for your ICP and the two to start with.
  3. 03You keep it. The signal map and a budget range, whether or not you build with us.

Ishan Vats, founder of IV Consulting. We run our own outbound on the same system.

More free GTM tools: Signal library · Email domain checker · Cold email calculator · GTM glossary · GTM and CRM setup

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