Email Validator

Email Address Validator — Validate Single or Bulk Email Lists with Quality Scoring

Invalid email addresses in your database are a silent problem with loud consequences: high bounce rates hurt your sender reputation with ISPs, disposable email addresses indicate low-intent signups that drain your sending credits, and malformed emails cause form processing errors that you only discover when they pile up in your error logs. This validator catches all these issues before they enter your system, with a 9-point checklist and a 0–100 quality score for every address.

How to validate email addresses

In single mode, type or paste an email address and see the full 9-point validation checklist update in real time: valid format, single @ symbol, valid local part characters, no leading or trailing dots, no consecutive dots, valid domain format, TLD length and character validation, and disposable email domain detection. The quality score (0–100) combines all checks and awards bonus points for addresses from well-known providers like Gmail, Outlook, Yahoo, or Apple. In bulk mode, paste a list of email addresses (one per line, or comma or semicolon separated) to validate the entire list at once and see a summary table with valid/invalid counts and individual results.

What the quality score means

A score of 80–100 indicates a well-formed address from a reputable provider — safe to store and email. A score of 50–79 indicates a valid format but either an unknown domain or missing bonus criteria — usable but worth monitoring bounce rates. A score below 50 typically means a disposable email domain, an unusual TLD, or a format issue — consider gating these with a double opt-in confirmation before adding to marketing lists. The disposable email detection checks against a built-in list of known temporary email services like Mailinator, Guerrilla Mail, and YopMail — these addresses are designed to be discarded immediately after signup and indicate low-quality or throwaway registrations.

Who uses this tool

Developers use it to test email validation logic and verify that their form validation regex matches expected results. Marketing operations teams use bulk mode to clean imported contact lists before uploading to Mailchimp, HubSpot, or similar email platforms. Customer support teams use it to verify a customer-provided email address before creating an account or sending a password reset. Startup founders use it for quick pre-launch list validation to ensure their waitlist emails are deliverable.

Privacy and data handling

All validation runs entirely in your browser — email addresses you check are never sent to any server or external API, making this safe for customer data and confidential contact lists.