How to test an email address to see if it is valid

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How can I test an email address to see if it is valid? For example, Facebook allows you to create an account with an incorrect email address after verifying with a phone number. Is it possible to check for a valid email address and if so how?

Best Answer

If the operating System is Windows you can verify by doing the following

To do it Follow these steps

1.Open Command Prompt

2.Find the exchanger of the domain By nslookup

   nslookup – q=mx gmail.com

3.Connect to mail Server using telnet

   telnet gmail.com 25

4.once you get the response

type some message hi ,hello

   mail from: <youremail@gmail.com>
   rcpt to: <test12345666@gmail.com>

5.If you get response code 550 then the recipient address is invalid

6.If email is vaild the mail server would respond back with code 250

Alternatively you could test using some online email checking tools like mailtester .

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