// Glossary
Email Verification
Checking whether an email address is real, correctly formatted, and able to receive mail before you send to it.
Definition
Email verification is the process of confirming that an email address exists and can accept messages, without sending a real email. It typically checks syntax, the domain's MX records, and the mailbox itself via an SMTP probe, then flags the address as valid, invalid, risky, or unknown. Verifying a list before a campaign reduces bounces, protects sender reputation, and improves deliverability.
Why email verification matters
Email verification checks whether an address can actually receive mail before you send to it — catching typos, dead mailboxes, and invalid domains that would otherwise bounce. It matters because bounces are the leading signal mailbox providers use to judge a sender: public deliverability guidance treats a hard-bounce rate under roughly 2% as healthy and flags senders sustained above the 2–5% band. Verifying close to send time (not once at scrape) is what keeps a list deliverable, because data age is the biggest driver of bounces.
Common questions
How does email verification work?+
A verifier checks syntax, confirms the domain has valid MX records, and does an SMTP-level check to see whether the mailbox exists — returning a status like valid, invalid, risky, or unknown.
Is a verified email guaranteed to be deliverable?+
No — verification greatly reduces bounces but can't guarantee delivery, since a mailbox can fill up or a filter can block a message. It's the single biggest lever you control, not a guarantee.
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