Guides

Practical guides to email verification and list hygiene: how a check works, what catch-all domains are, how to clean a list and how to keep bounces down. Each one ends with links into the product and the docs.

What is email verification?

How email verification checks syntax, domains, MX records and mailboxes, how it differs from validation, and what it can and cannot tell you.

Catch-all emails explained

Why some domains accept mail for any address, why verifiers cannot confirm those mailboxes, and practical rules for sending to catch-all results.

How to clean an email list

A step-by-step method to clean an email list: export, verify, segment by status, suppress and re-check. What to remove and what to keep.

Reduce your email bounce rate

Hard and soft bounces, why they hurt sender reputation, and the checks that prevent them before you send. With a checklist for each campaign.

Verify an email address without sending a message

How mail servers can confirm a mailbox during the SMTP conversation, why some refuse to, and DIY checks compared with a verification service.

Looking for a single term? See the glossary. Building an integration? Start with the documentation.