title: How should I verify email address existence and domain name existence in javascript or nodeJs?
body: <p>I have tried so many npm packages to verify the email address and domain name.
  Here are the some of the npm packages I have tried</p>
  
  <pre><code>email-check,
  email-verify,
  email-existence, 
  legit,
  email-validator and,
  email validation 
  </code></pre>
  
  <p>all these results in domain name existence and some other checks only.
  But I have to verify the particular email address exist in the domain. 
  How should I achieve this...
  <em>Can anyone pls help me to find it out</em>
  <em>Thanks in advance!!</em></p>