Know Validation of a email account,..

Many Times we are sens a email to any person.But after some time we recieve a bounce message that Email id is'nt valid. If we know Quickly that whoose email id to we send a email that is'nt valid.So we can try to know real email adress .There are no option to know ID validation. Come now know how to know validation of email Id.

GOOGLE - https://www.google.com/accounts/recovery
YAHOO - https://edit.yahoo.com/forgotroot
HOTMAIL - https://account.live.com/ResetPassword.aspx