If you’re seeing the “Address Not Found” error in Gmail, it means your email couldn’t be delivered to the recipient. This issue usually occurs due to incorrect email addresses, domain errors, temporary server problems, or outdated autofill entries. Learning how to fix address not found Gmail helps you quickly resolve sending issues and ensure your messages reach the right inbox. By verifying the recipient’s email address, checking spelling mistakes, reviewing DNS or domain activity, clearing old cached suggestions, and confirming the recipient’s mailbox is active, you can easily troubleshoot this common Gmail error.