DOCUMENTATION
& UPDATES.

Technical guides, API references, and product updates from across the Craften ecosystem.

PRODUCT

EMAIL VERIFIER

Learn how to check if an email address is real without sending a test message, and understand the limits of email verification.

Double opt-in and email verification solve different problems. Here is how each one works, where they overlap, and when you should use both.

A clear 2026 guide to email verification for marketers, including what it is, why it matters, and how to use it without overcomplicating the process.

A practical cold email verification guide for reducing bounce rate, protecting sender reputation, and checking addresses before outreach.

A practical guide to catch-all emails, why they are tricky, and how to decide whether to send, suppress, or segment them.

Learn how to protect your sender reputation with cleaner list practices, lower complaint rates, and better email hygiene.