Forms Email Validator

Most online forms currently only perform email format validation and don't check whether users enter invalid emails (ie. dummy emails, temporary emails, invalid domains). In other words, only text format is checked and reachability is not. And such validation only occurs on the form creator's end once they've gotten access to the responses spreadsheet, allowing for the possibility of user responses not being accurately captured. This extension allows users to vet their responses prior to submission, ensuring that their responses are being recorded accurately.