📖 Glossary
What is Double Opt-In (Confirmed Opt-In)?
A subscription process requiring a new subscriber to verify their email address by clicking a link sent in a confirmation email before being added to the list.
Detailed Explanation
Double opt-in is the gold standard for building a high-quality, engaged email list. It prevents fake signups, typos, and malicious bots from injecting unverified or harmful addresses (like spam traps) into your database. By ensuring the owner of the email address actively confirms their subscription, you protect your sender reputation and improve deliverability.
Related Terms
Start Verifying Emails Today
Get 98%+ accuracy with AI-powered verification. 100 free credits, no credit card required.
✓ 100 Free Credits✓ Improve Deliverability✓ Detect Catch-alls