I want to create user Registration with their email address

Nilesh Jadav , Thanks for contineous reponses and prompt responses The second example shared by you is still using the same techniques in this case it is in the user hand to use [email protected], or [email protected] , I want when the user input [email protected] the system should check that [email protected] is actually existing in gmail server or not using SMTP or POP3

Hi Nilesh Jadav Thanks for prompt Response My Question is not like that Listen Now I have a User Registration Form Through which user have to sign up the Fiels are (userid,Name,Email,Password) I want to prevent the user from input email other than their gmail Already existed account like [email protected] if this does not exists in real then the the system should send them a message , my question is integrating gmail email address as your email is User Registration Form