Invited friends by Email

I tested to invite friends by email and I noted even though we use the wrong email or fake email, the system still send and users get points.

Is there any way that user can check the email correct or not and if they send fake email so the system will not send.

now if I send this saovrysok@hotmail.com, it is will go
now if I send this saovrysok@hote.com, it is will go
now if I send this saofdsfdsffghfghfhvrysok@hote.com, it is will go

Do you have any ideas to fix this?

thank