Verify The Existence of An Email-id

Many time we  send important email to someone and after few minutes the email server bounce back a message which is indicate that the current email is not valid and do not exist. If we already come to know that the receiver email id is valid or not then our work become easier to us and by knowing the correct email id, we can send our message ASAP.
For verification of an email id there is no validation test is available but there is a method exist which we can use to verify the existence of an email-id. The plus point of this method is you do not need to send the message on the receiver email id.
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