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PHP script t verify an email

Ashraf Hassanein
Last Modified: 2013-12-26
I want to write a script which verifies the email address, and I how wrote the following script:
  echo $domain."\n";
  $ip = gethostbyname($domain);
  $hostname = gethostbyaddr($ip);
  $hosts=checkdnsrr($domain, 'MX');
  echo $hosts."\n";
  echo $hostname."\n";
  echo $ip."\n";

For google email I am getting:

BUT for xxxxxxx.com:

And for yyyyyyy.com:

How reliable is this check? I was expecting not to get anything in case of faulty domain, but I do, and I get as well the same answer in case of normal nslookup from the command line, and is there is any more strict script which can verify the email server?
P.S. I running this check from another email server.
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