MailSentry Documentation

Learn how to verify email addresses, understand results, and integrate with your favorite tools.

Quick start

Learn why email verification matters and how it protects your sender reputation.

Validate your first email in under a minute. Copy a snippet, paste your key, done.

Learn what each result code means and how to act on scores and verdicts.

A deep look at every check MailSentry runs — and what each one catches.

How the 0-100 score is calculated, what each verdict means, and recommended actions.

Test your integration with deterministic mock responses — zero credits used.

Why temporary mailboxes are dangerous and how we detect them.

What happens when a server accepts everything — and why it's risky.

Why info@, support@, and noreply@ are different from personal emails.

Hidden honeypot addresses that can destroy your sender reputation.

How we talk directly to the mail server to confirm a mailbox exists.

Create a free account and validate your first email in under a minute.