email validation (no regex)

[Jim Moseby <JMoseby@xxxxxxxxxxxxxxxxx>]

I threw together this totally untested and unreliable code to solicit
comments on whether or not this is a good way to validate emails.  Consider
the following:

<pseudocode>

function validate_email($email){
  if (str_word_count($email,'@')!=1){return('Not a proper email address');}
  $parts=explode('@',$email);
  $name=$parts[0];
  $domain=$parts[1];
  $mxconnect=FALSE;
  if (!getmxrr($domain,$mxhosts)){
    return('Invalid domain');
  }//if
  foreach($mxhosts as $mxhost){
    if($fp=fsockopen($mxhost,25)){
      $mxconnect=TRUE;
      fwrite($fp,"EHLO test");
      $response=fread($fp,256);
      fwrite($fp, "Mail From: jim@xxxxxxxxxxx".chr(13));
      $response=fread($fp,256);
      fwrite($fp, 'RCPT To: '.$email.chr(13));
      $response=fread($fp,256);
      $parts=explode(' ',$response);
      if ($parts[0]!='250'){
        fwrite($fp,'QUIT'.chr(13));
        fclose($fp);
        return('Unknown Recipient');
      }//if
    }//if
  }//foreach
  if (!$mxconnect){return('Could not connect to MX');}
  fwrite($fp,'QUIT'.chr(13));
  fclose($fp);
  return('OK');
}//function validate_email

</pseudocode>

So, what is the general thought about validating email addresses in this
manner?

JM

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