1  
   2  <?php
   3  
   4  function validate_email($email){
   5  
   6  $exp = "^[a-z\'0-9]+([._-][a-z\'0-9]+)*@([a-z0-9]+([._-][a-z0-9]+))+$";
   7  
   8  if(eregi($exp,$email)){
   9  	if(checkdnsrr(array_pop(explode("@",$email)),"MX")){
  10  		print("$email is ok.<br>");
  11  			}else{
  12  			print("$email is ok. But domain is not.<br>");
  13  			}
  14  				}else{
  15  				print("$email is not ok.<br>");
  16  				}   
  17  }
  18  
  19  validate_email("shantanu.ok");
  20  validate_email("shantanu.ok@gmail.com");
  21  validate_email("shantanu.ok@fsjaldkfjlsfjsljflsfjsldk.com");
  22  
  23  ?>