Email checker/exist or not

I use joomla 1.5.By chrono form i creat a submit form ,a emailfield is there where people give their emailid and that email id is saved in server.but many people give their fake emailid and our server is loaded.I want an email checker which check the email id exist or not,If exist then submit the form ,if not exist then give a warning.This is not email validation,It is email checker which i want.My question is if any type of email checker is there in chrono form ?and if there is any, how can i use it?
SUTANDRA

Hi SUTANDRA,

There is nothing built in to ChronoForms. There are some email-checkers that exist and it might be possible to use one of those with some code in the ServerSide Validation box to somehow block unwanted emails.

Bob