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| <?
highlight_file(__FILE__);
function validateEmail($email, $domainCheck = false, $verify = false, $return_errors=false) {
global $debug;
if($debug) {echo "<pre>";}
$errors = array();
# Check syntax with regex
if (preg_match('/^([a-zA-Z0-9\._\+-]+)\@((\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,7}|[0-9]{1,3})(\]?))$/', $email, $matches)) {
$user = $matches[1];
$domain = $matches[2];
# Check availability of DNS MX records
if ($domainCheck && function_exists('checkdnsrr')) {
# Construct array of available mailservers
if(getmxrr($domain, $mxhosts, $mxweight)) {
for($i=0;$i<count($mxhosts);$i++){
$mxs[$mxhosts[$i]] = $mxweight[$i];
}
asort($mxs);
$mailers = array_keys($mxs);
} elseif(checkdnsrr($domain, 'A')) {
$mailers[0] = gethostbyname($domain);
} else {
$mailers=array();
}
$total = count($mailers);
# Query each mailserver
if($total > 0 && $verify) {
# Check if mailers accept mail
for($n=0; $n < $total; $n++) {
# Check if socket can be opened
if($debug) { echo "Checking server $mailers[$n]...\n";}
$connect_timeout = 2;
$errno = 0;
$errstr = 0;
$probe_address = 'postmaster@tienhuis.nl';
# Try to open up socket
if($sock = @fsockopen($mailers[$n], 25, $errno , $errstr, $connect_timeout)) {
$response = fgets($sock);
if($debug) {echo "Opening up socket to $mailers[$n]... Succes!\n";}
stream_set_timeout($sock, 5);
$meta = stream_get_meta_data($sock);
if($debug) { echo "$mailers[$n] replied: $response\n";}
$cmds = array(
"HELO outkast.tienhuis.nl", # Be sure to set this correctly!
"MAIL FROM: <$probe_address>",
"RCPT TO: <$email>",
"QUIT",
);
# Hard error on connect -> break out
if(!$meta['timed_out'] && !preg_match('/^2\d\d[ -]/', $response)) {
$error = "Error: $mailers[$n] said: $response\n";
break;
}
foreach($cmds as $cmd) {
$before = microtime(true);
fputs($sock, "$cmd\r\n" );
$response = fgets($sock, 4096);
$t = 1000*(microtime(true)-$before);
if($debug) {echo htmlentities("$cmd\n$response" ) . "(" . sprintf('%.2f', $t) . " ms)\n";}
if(!$meta['timed_out'] && preg_match('/^5\d\d[ -]/', $response)) {
$error = "Unverified address: $mailers[$n] said: $response";
break 2;
}
}
fclose($sock);
if($debug) { echo "Succesful communication with $mailers[$n], no hard errors, assuming OK";}
break;
} elseif($n == $total-1) {
$errors = "None of the mailservers listed for $domain could be contacted";
}
}
} else {
$error = "No usable DNS records found for domain '$domain'";
}
}
} else {
$error = 'Address syntax not correct';
}
if($debug) { echo "</pre>";}
#echo "</pre>";
if($return_errors) {
# Give back details about the error(s).
# Return FALSE if there are no errors.
# Keep this in mind when using it like:
# if(checkEmail($addr)) {
# Because of this strange behaviour this
# is not default ;-)
if(isset($error)) return htmlentities($error); else return false;
} else {
# 'Old' behaviour, simple to understand
if(isset($error)) return false; else return true;
}
}
?> |
