电子邮件验证知道电子邮件确实存在于使用php的服务器

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我正在尝试创建一个功能,我可以检查是否真的存在电子邮件我搜索各种论坛,但代码只适用于gmail而不是其他我正在检查mx记录我可以做些什么来连接到那些mx记录并询问服务器如果电子邮件确实存在与否。我已添加了大量代码,以便您可以了解我需要做什么谢谢

private function verifyEmail($toemail, $fromemail, $getdetails = false)
    {
        $result='';
        $details=' ';
        // Get the domain of the email recipient
        $email_arr = explode('@', $toemail);
        $domain = array_slice($email_arr, -1);
        $domain = $domain[0];

        // Trim [ and ] from beginning and end of domain string, respectively
        $domain = ltrim($domain, '[');
        $domain = rtrim($domain, ']');

        if ('IPv6:' == substr($domain, 0, strlen('IPv6:'))) {
            $domain = substr($domain, strlen('IPv6') + 1);
        }

        $mxhosts = array();
        // Check if the domain has an IP address assigned to it
        if (filter_var($domain, FILTER_VALIDATE_IP)) {
            $mx_ip = $domain;
        } else {
            // If no IP assigned, get the MX records for the host name
            getmxrr($domain, $mxhosts, $mxweight);
        }

        if (!empty($mxhosts)) {
            $mx_ip = $mxhosts[array_search(min($mxweight), $mxhosts)];
        } else {
            // If MX records not found, get the A DNS records for the host
            if (filter_var($domain, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
                $record_a = dns_get_record($domain, DNS_A);
                // else get the AAAA IPv6 address record
            } elseif (filter_var($domain, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
                $record_a = dns_get_record($domain, DNS_AAAA);
            }

            if (!empty($record_a)) {
                $mx_ip = $record_a[0]['ip'];
            } else {
                // Exit the program if no MX records are found for the domain host
                $result = 'Invalid Email MX ';
                $details .= 'No suitable MX records found.';

                return ((true == $getdetails) ? array($result, $details) : $result);
            }
        }

        // Open a socket connection with the hostname, smtp port 25
        $connect = @fsockopen($mx_ip, 25);

        if ($connect) {

            // Initiate the Mail Sending SMTP transaction
            if (preg_match('/^220/i', $out = fgets($connect, 1024))) {

                // Send the HELO command to the SMTP server
                fputs($connect, "HELO $mx_ip\r\n");
                $out = fgets($connect, 1024);
                $details .= $out."\n";

                // Send an SMTP Mail command from the sender's email address
                fputs($connect, "MAIL FROM: <$fromemail>\r\n");
                $from = fgets($connect, 1024);
                $details .= $from."\n";

                // Send the SCPT command with the recepient's email address
                fputs($connect, "RCPT TO: <$toemail>\r\n");
                $to = fgets($connect, 1024);
                $details .= $to."\n";

                // Close the socket connection with QUIT command to the SMTP server
                fputs($connect, 'QUIT');
                fclose($connect);

                // The expected response is 250 if the email is valid
                if (!preg_match('/^250/i', $from) || !preg_match('/^250/i', $to)) {
                    $result = 'Invalid Email Address';
                } else {
                    $result = 'Valid Email Address';
                }
            }else{echo 'layht';}
        } else {
            $result = 'Invalid Email Address';
            $details .= 'Could not connect to server';
        }
        if ($getdetails) {
            return array($result, $details);
        } else {
            return $result;
        }
    }
提问于
用户回答回答于

确定电子邮件地址是否存在的唯一方法是向其发送邮件并从用户那里获得响应。

过去,可以使用SMTP查询远程服务器并询问地址是否有效; 然而,因为垃圾邮件发送者使用它来收集地址,它不再有效。

在过去,也可以将邮件发送到服务器,如果没有被拒绝,则认为它是有效的地址,但这也不再可靠。

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