This is a function I've been using in a few projects, I just added the last few lines for you to also check if the hostname is valid. function isValidEmail($address) { $valid_tlds = array('arpa', 'biz', 'com', 'edu', 'gov', 'int', 'mil', 'net', 'org', 'ad', 'ae', 'af', 'ag', 'ai', 'al', 'am', 'an', 'ao', 'aq', 'ar', 'as', 'at', 'au', 'aw', 'az', 'ba', 'bb', 'bd', 'be', 'bf', 'bg', 'bh', 'bi', 'bj', 'bm', 'bn', 'bo', 'br', 'bs', 'bt', 'bv', 'bw', 'by', 'bz', 'ca', 'cc', 'cf', 'cd', 'cg', 'ch', 'ci', 'ck', 'cl', 'cm', 'cn', 'co', 'cr', 'cs', 'cu', 'cv', 'cx', 'cy', 'cz', 'de', 'dj', 'dk', 'dm', 'do', 'dz', 'ec', 'ee', 'eg', 'eh', 'er', 'es', 'et', 'fi', 'fj', 'fk', 'fm', 'fo', 'fr', 'fx', 'ga', 'gb', 'gd', 'ge', 'gf', 'gh', 'gi', 'gl', 'gm', 'gn', 'gp', 'gq', 'gr', 'gs', 'gt', 'gu', 'gw', 'gy', 'hk', 'hm', 'hn', 'hr', 'ht', 'hu', 'id', 'ie', 'il', 'in', 'io', 'iq', 'ir', 'is', 'it', 'jm', 'jo', 'jp', 'ke', 'kg', 'kh', 'ki', 'km', 'kn', 'kp', 'kr', 'kw', 'ky', 'kz', 'la', 'lb', 'lc', 'li', 'lk', 'lr', 'ls', 'lt', 'lu', 'lv', 'ly', 'ma', 'mc', 'md', 'mg', 'mh', 'mk', 'ml', 'mm', 'mn', 'mo', 'mp', 'mq', 'mr', 'ms', 'mt', 'mu', 'mv', 'mw', 'mx', 'my', 'mz', 'na', 'nc', 'ne', 'nf', 'ng', 'ni', 'nl', 'no', 'np', 'nr', 'nt', 'nu', 'nz', 'om', 'pa', 'pe', 'pf', 'pg', 'ph', 'pk', 'pl', 'pm', 'pn', 'pr', 'pt', 'pw', 'py', 'qa', 're', 'ro', 'ru', 'rw', 'sa', 'sb', 'sc', 'sd', 'se', 'sg', 'sh', 'si', 'sj', 'sk', 'sl', 'sm', 'sn', 'so', 'sr', 'st', 'su', 'sv', 'sy', 'sz', 'tc', 'td', 'tf', 'tg', 'th', 'tj', 'tk', 'tm', 'tn', 'to', 'tp', 'tr', 'tt', 'tv', 'tw', 'tz', 'ua', 'ug', 'uk', 'um', 'us', 'uy', 'uz', 'va', 'vc', 've', 'vg', 'vi', 'vn', 'vu', 'wf', 'ws', 'ye', 'yt', 'yu', 'za', 'zm', 'zr', 'zw', 'eu', 'info'); $address = strtolower($address); if (!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*$/i", $address)) { return false; } $name_domain = explode("@", $address); if (count($name_domain) != 2) { return false; } $domain_parts = explode(".", $name_domain[1]); if (count($domain_parts) < 2) { return false; } if (!in_array($domain_parts[count($domain_parts) - 1], $valid_tlds)) { return false; } if (gethostbyname($name_domain[1]) == $name_domain[1]) { return false; } return true; } PHP:
He wanted a solution via DNS, which is what the above code does. It allows nothing more than checking the validity of a domain, not of an e-mail address. (The function also checks if the format of the given e-mail address is valid) I wouldn't be surprised if he actually meant to check the existance of an e-mail address via SMTP, which theoretically could be done, but due to different mailserver implementations and often missing error codes in case an e-mail address doesn't exist on a server this, imo, cannot be implemented in a reliable way.
hi it working for dns check,mail sever checking after how to valid that user? i will try for fsocket program . in this process not connect to the RCPT TO any one know help me <?php $email1="srikanth.warriorz@gmail.com"; validate_email($email1); function validate_email($email) { $mailparts=explode("@",$email); echo $hostname = $mailparts[1]; echo "<br>"; // validate email address syntax $exp = "^[a-z\'0-9]+([._-][a-z\'0-9]+)*@([a-z0-9]+([._-][a-z0-9]+))+$"; $b_valid_syntax=eregi($exp, $email); // get mx addresses by getmxrr $b_mx_avail=getmxrr( $hostname, $mx_records, $mx_weight ); $b_server_found=0; if($b_valid_syntax && $b_mx_avail) { // copy mx records and weight into array $mxs $mxs=array(); for($i=0;$i<count($mx_records);$i++) { echo $mxs[$mx_weight[$i]]=$mx_records[$i];echo "<br>"; } // sort array mxs to get servers with highest prio ksort ($mxs, SORT_NUMERIC ); reset ($mxs); while (list ($mx_weight, $mx_host) = each ($mxs) ) { echo "<br>"; echo "<b>we</b><br>".$mx_weight."<br><b>host</b><br>".$mx_host; echo "<br>"; if($b_server_found == 0) { //try connection on port 25 $fp = @fsockopen($mx_host,25, $errno, $errstr, 2); if($fp) { echo "server connected";echo "<br>"; $ms_resp=""; // say HELO to mailserver echo $ms_resp.=send_command($fp, "HELO yahoo.com"); echo "<br>"; // initialize sending mail $ms_resp.=send_command($fp, "MAIL FROM:<support@yahoo.com>"); // try receipent address, will return 250 when ok.. echo $rcpt_text=send_command($fp, "RCPT TO:<".$email.">"); echo $ms_resp.=$rcpt_text; if(substr( $rcpt_text, 0, 3) == "250") echo $b_server_found=1; // quit mail server connection $ms_resp.=send_command($fp, "QUIT"); echo $ms_resp; fclose($fp); } } } } return $b_server_found; } function send_command($fp, $out){ fwrite($fp, $out . "\r\n"); return get_data($fp); } function get_data($fp){ $s=""; stream_set_timeout($fp, 2); for($i=0;$i<2;$i++) $s.=fgets($fp, 1024); return $s; } // support windows platforms if (!function_exists ('getmxrr') ) { function getmxrr($hostname, &$mxhosts, &$mxweight) { if (!is_array ($mxhosts) ) { $mxhosts = array (); } if (!empty ($hostname) ) { $output = ""; @exec ("nslookup.exe -type=MX $hostname.", $output); $imx=-1; foreach ($output as $line) { $imx++; $parts = ""; if (preg_match ("/^$hostname\tMX preference = ([0-9]+), mail exchanger = (.*)$/", $line, $parts) ) { $mxweight[$imx] = $parts[1]; $mxhosts[$imx] = $parts[2]; } } return ($imx!=-1); } return false; } } ?>
And you're totaly sure that your script is working? That if I made works perfectly. You can test it by replacing the function with: function validate_email($email){ if($email == "error"){ return false; }else{ return true; } It should echo "E-mail is not valid" if you write "error" as the email, if not, it shouldn't return anything