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PHP isValidEmail

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This is a slightly hard core email check. I work for clients that want real email addresses. They pay quite a bit of money so yes, I am going to give what they want...

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  1. <?php
  2. // FUNCTION: isValidEmail( $email )
  3. // 
  4. // return wether an email is valid.
  5. //
  6. // This is a hard core check cause we check the domain and we even check
  7. // that the email is not one of the disposable email places.
  8. //
  9. // undisposable.net is a great service!
  10. // tells wether or not the email you are getting
  11. // is a mailinator or other disposable address
  12. //
  13. // Sorry but when a client pays 40,000 Euros for a web campaign
  14. // they want real email addresses.
  15. //
  16. function isValidEmail( $email )
  17. {
  18.     // first thing to do is 
  19.     // lets strip out the domain cause we are going to check the domain
  20.     $domainname= explode("@",$email);
  21.     $checkdomain= $domainname[1];
  22.  
  23.     // check if the filter works, then check that the domain is real
  24.     if( filter_var( $email , FILTER_VALIDATE_EMAIL) &&  
  25.         checkdnsrr( $checkdomain ) )
  26.     {
  27.         // ok it seems that we have real email address
  28.         // now lets see if the email is in the disposable
  29.         // email address lists.
  30.  
  31.         $url  = "http://www.undisposable.net/services/php/";
  32.         $url .= "isDisposableEmail/?email=".addslashes($email);
  33.         $res = @file_get_contents($url);
  34.         $uns = @unserialize($res);
  35.         if($uns['stat']=='ok')
  36.         {
  37. 	    return ( $uns['email']['isdisposable'] != "yes" );
  38.         }
  39.         else
  40.         {
  41.             return false;
  42.         }
  43.      }
  44.      else
  45.      {
  46.           return false;
  47.      }
  48. }
  49. ?>

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