Detection de bonne adresse email

 public static function checkemail($email)
  {
    // see http://www.devshed.com/c/a/PHP/Email-Address-Verification-with-PHP/2/
    // checks proper syntax
    if (!preg_match("/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\._-]+)+$/" , $email))
      {
	return false;
      }
    //DEBUG NO NETWORK
    //return true;
    // gets domain name
    list($username,$domain)=split('@',$email);
    // checks for if MX records in the DNS
    $mxhosts = array();

    if(!@getmxrr($domain, $mxhosts)) {
      // no mx records, ok to check domain
      if (!@fsockopen($domain,25,$errno,$errstr,30)) {
	return false;
      } else {
	return true;
      }
    } else {
      // mx records found
      foreach (@$mxhosts as $host) {
	if (@fsockopen($host,25,$errno,$errstr,30)) {
	  return true;
	}
      }
      return false;
    }
  }