There are several methods to validate new subscribers:
Email Verification Tools: Use email verification tools that check the syntax, domain, and mailbox existence of email addresses. Some popular tools include ZeroBounce, NeverBounce, and Hunter. Double Opt-In: Implement a double opt-in process where new subscribers confirm their email address by clicking on a verification link sent to their inbox. This ensures that the email address is valid and belongs to the user. Honeypots and CAPTCHA: Use honeypots and CAPTCHA in your signup forms to prevent bots from entering invalid email addresses. Real-Time Validation: Integrate real-time validation API into your sign-up forms to instantly verify email addresses as users enter them.