You can sending an email such as an welcome message and if it returns an error, such as miss delivery or something, then you know the email is fake. http://php.net/manual/en/function.mail.php ex(not actually code). if(mail()) {} else { echo invalid email }
You can use regex: <?php $ymail = "danx10@digitalpoint.com"; if(preg_match("/^([a-z0-9_]{4,}|[a-z0-9_]{4,}@yahoo\.[a-z\.]{2,})$/i", $ymail)){ echo "Valid"; } else { echo "Invalid! Yahoo ID"; } ?> PHP: Enjoy
In the past you could check if he have a profile : http://profiles.yahoo.com/badguy_goodguy now, is harder, lol
try to sent an email to the address,... if there's no respon,.. is valid then other wise.... got notification