Simple registration form and login form created with bootstrap for the demostration of activating user account by email verification with following features.
Failed to authenticate password. Error: 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 h27-v6sm74818114pfk.160 - gsmtp
Unable to send email using PHP SMTP. Your server might not be configured to send mail using this method.