Confirming an email address means ensuring it is correct before you store or use it. This is critical at sign-up forms, checkout flows, and anywhere you collect contact information.
How to Confirm an Email Address
1. Validate on the form in real time
Use the BillionVerify API to check the address as the user types. Show instant feedback — "This email looks invalid" or "This domain does not accept email" — before the user submits.
2. Send a confirmation email (double opt-in)
After sign-up, send a confirmation link to the address. Only activate the account once the user clicks. This confirms the address is real, accessible, and belongs to the person signing up.
3. Check for typos in common domains
Misspellings like gamil.com, yaho.com, or hotmial.com are common. Use a typo-suggestion library to catch and correct these before the user moves on.
4. Store only confirmed addresses
Do not add unconfirmed addresses to your active list. Keep a pending queue and move addresses to your main list only after they confirm.