如何发送电子邮件地址是否有效？ [英] How do I check if an email address is valid without sending anything to it?

问题描述

我有一个客户端，他有一个旧的名单上有5000封电子邮件，他希望推广他的服务。他想知道列表中的哪些电子邮件仍然有效。我想检查他们 - 没有发送5K电子邮件，然后被列为垃圾邮件发送者或某事。想法？

解决方案

bucabay的答案是前进的道路。这样的库本质上是检查指定域（A，MX或AAAA）上的（邮件）服务器的现有DNS记录。之后，它做了所谓的回调验证。这就是您连接到邮件服务器的地方，告诉您要发送到特定的电子邮件地址，看看他们是否可以。

对于回调验证，您应该注意灰名单服务器对所有内容都说可以，所以没有100％的保证可能没有实际发送电子邮件。这是我手动使用的一些代码。来自这里的电子邮件地址解析器的补丁。

 ＃
＃电子邮件回调验证
＃根据http://uk2.php.net/manual/en/function.getmxrr。 （$ bits {'domain-literal']））{
 $ records = 
} elseif（！getmxrr（$ bits ['domain']，$ mx_records，$ mx_weight））{
 $ records = array（$ bits ['domain']）; 
} else {
 $ mxs = array（）; （$ i = 0; $ i< count（$ mx_records）; $ i ++）{
 $ mxs [$ mx_records [$ i]] = $ mx_weight [$ i] 
 
 ; 
} 
 
 asort（$ mxs）; 
 
 $ records = array_keys（$ mxs）; 
} 
 
 $ user_okay = false; （$ j = 0; $ j< count（$ records）&！$ user_okay; $ j ++）{
 $ fp = @fsockopen（$ records [$ j]，25 ，$ errno，$ errstr，2）; 
 if（$ fp）{
 $ ms_resp =; 
 
 $ ms_resp。= send_command（$ fp，HELO ******。com）; 
 $ ms_resp。= send_command（$ fp，MAIL FROM：<>）; 
 
 $ rcpt_text = send_command（$ fp，RCPT TO：<$ email。>）; 
 $ ms_resp。= $ rcpt_text; 
 
 $ ms_code = intval（substr（$ rcpt_text，0，3））; 
 if（$ ms_code == 250 || $ ms_code == 451）{//接受greylisting服务器上的所有用户帐户
 $ user_okay = true; 
} 
 
 $ ms_resp。= send_command（$ fp，QUIT）; 
 
 fclose（$ fp）; 
} 
} 
 
 return $ user_okay？ 1：0; 
  

I have a client with 5000 emails from an old list he has that he wants to promote his services to. He wants to know which emails on the list are still valid. I want to check them for him - without sending out 5K emails randomly and then being listed as a spammer or something. Ideas?

解决方案

bucabay's answer is the way forward. What a library like that essentially does is checking for existing DNS record for (mail) servers at specified domains (A, MX, or AAAA). After that, it do what's termed callback verification. That's where you connect to the mail server, tell it you want to send to a particular email address and see if they say OK.

For callback verification, you should note greylisting servers say OK to everything so there is no 100% guarantee possible without actually sending the emails out. Here's some code I used when I did this manually. It's a patch onto the email address parser from here.

    #
    # Email callback verification
    # Based on http://uk2.php.net/manual/en/function.getmxrr.php
    #

    if (strlen($bits['domain-literal'])){
        $records = array($bits['domain-literal']);
    }elseif (!getmxrr($bits['domain'], $mx_records, $mx_weight)){
        $records = array($bits['domain']);
    }else{
        $mxs = array();

        for ($i = 0; $i < count($mx_records); $i++){
            $mxs[$mx_records[$i]] = $mx_weight[$i];
        }

        asort($mxs);

        $records = array_keys($mxs);
    }

    $user_okay = false;
    for ($j = 0; $j < count($records) && !$user_okay; $j++){
        $fp = @fsockopen($records[$j], 25, $errno, $errstr, 2);
        if($fp){
            $ms_resp = "";

            $ms_resp .= send_command($fp, "HELO ******.com");
            $ms_resp .= send_command($fp, "MAIL FROM:<>");

            $rcpt_text = send_command($fp, "RCPT TO:<" . $email . ">");
            $ms_resp .= $rcpt_text;

            $ms_code = intval(substr($rcpt_text, 0, 3));
            if ($ms_code == 250 || $ms_code == 451){ // Accept all user account on greylisting server
                $user_okay = true;
            }

            $ms_resp .= send_command($fp, "QUIT");

            fclose($fp);
        }
    }

return $user_okay ? 1 : 0;

这篇关于如何发送电子邮件地址是否有效？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！