我想通过smtp验证电子邮件地址是否有效
我无法在codeigniter中验证电子邮件。
这是错误
fwrite():发送34个字节失败,错误为errno = 10054已存在 连接被远程主机强行关闭。
此方法检查电子邮件是否确实存在
我在这段代码的不同行中有两个相同的错误
function isValidEmail($email){
$result=false;
# BASIC CHECK FOR EMAIL PATTERN WITH REGULAR EXPRESSION
if(!preg_match('/^[_A-z0-9-]+((\.|\+)[_A-z0-9-]+)*@[A-z0-9-]+(\.[A-z0-9-]+)*(\.[A-z]{2,4})$/',$email))
return $result;
# MX RECORD CHECK
list($name, $domain)=explode('@',$email);
if(!checkdnsrr($domain,'MX'))
return $result;
# SMTP QUERY CHECK
$max_conn_time = 30;
$sock='';
$port = 25;
$max_read_time = 5;
$users=$name;
# retrieve SMTP Server via MX query on domain
$hosts = array();
$mxweights = array();
getmxrr($domain, $hosts, $mxweights);
$mxs = array_combine($hosts, $mxweights);
asort($mxs, SORT_NUMERIC);
#last fallback is the original domain
$mxs[$domain] = 100;
$timeout = $max_conn_time / count($mxs);
# try each host
while(list($host) = each($mxs)) {
#connect to SMTP server
if($sock = fsockopen($host, $port, $errno, $errstr, (float) $timeout)){
stream_set_timeout($sock, $max_read_time);
break;
}
}
# did we get a TCP socket
if($sock) {
$reply = fread($sock, 2082);
preg_match('/^([0-9]{3}) /ims', $reply, $matches);
$code = isset($matches[1]) ? $matches[1] : '';
if($code != '220') {
# MTA gave an error...
return $result;
}
# initiate smtp conversation
$msg="HELO ".$domain;
fwrite($sock, $msg."\r\n");
$reply = fread($sock, 2082);
# tell of sender
$msg="MAIL FROM: <".$name.'@'.$domain.">";
fwrite($sock, $msg."\r\n");
$reply = fread($sock, 2082);
#ask of recepient
$msg="RCPT TO: <".$name.'@'.$domain.">";
fwrite($sock, $msg."\r\n");
$reply = fread($sock, 2082);
#get code and msg from response
preg_match('/^([0-9]{3}) /ims', $reply, $matches);
$code = isset($matches[1]) ? $matches[1] : '';
if($code == '250') {
#you received 250 so the email address was accepted
$result=true;
}elseif($code == '451' || $code == '452') {
#you received 451 so the email address was greylisted
#_(or some temporary error occured on the MTA) - so assume is ok
$result=true;
}else{
$result=false;
}
#quit smtp connection
$msg="quit";
fwrite($sock, $msg."\r\n");
# close socket
fclose($sock);
}
return $result;
}
$email='test1221s@gmail.com';
if(isValidEmail($email))
echo "**** EMAIL EXISTS ****";
else
echo "**** NOT A VALID EMAIL ****";
答案 0 :(得分:0)
此方法检查电子邮件是否确实存在
你不能这样做,而另一方也不想和你说话,因为你试过了。
过去,抓取工具会通过询问服务器是否存在user@domain.com来收集电子邮件地址。然后是user1@domain.com。然后是user2@domain.com等。
他们最终会得到一份有效的垃圾邮件用户列表。
从那以后,邮件服务器变得不那么开放了,并且#34; chatty&#34;并且不会回答这些问题,并且在发生一些失败后实际上会禁止你的地址。
您所能做的就是发送实际的电子邮件并处理退回(如果它无法送达)。如果你坚持&#34;检查&#34;电子邮件地址以确定它们是否良好,您会发现很快就会有一个列入黑名单的IP地址。