Did you encounter this error even if your password is correct? “Authentication failed. Please check your username/password. [Server response: 534-5.7.14 Please log in via your web browser and 534-5.7.14 then try again. 534-5.7.14 Learn more at 534 5.7.14 https://support.google.com/mail/answer/78754 m3sm2558931lfb.8 – gsmtp code(534) ]” Then you’ve come to the right place.