email validation (no regex)
| From: | Jim Moseby | Date: | Wed, 21 Sep 2005 17:49:35 +0000 |
| Subject: | email validation (no regex) | ||
| Groups: | php.general | ||
| Request: | Send a blank email to php-general+get-222895@lists.php.net to get a copy of this message | ||
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@example.com".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