Some wrap classes to make laravel life easy.

EmailVerifier.php

<?php

namespace App\Services\EmailVerify;

use \DOMDocument;
use \DOMXpath;
use Log;

/**
 *  Verifies email address by attempting to connect and check with the mail server of that account
 */
class EmailVerifier
{
    public $email;
    private $verifierEmail;
    public $port;
    private $mx;
    private $connect;
    private $debug;
    private $debugRaw;

    private $_yahooSignupPageUrl = 'https://login.yahoo.com/account/create?specId=yidReg&lang=en-US&src=&done=https%3A%2F%2Fwww.yahoo.com&display=login';
    private $_yahooSignupAjaxUrl = 'https://login.yahoo.com/account/module/create?validateField=yid';
    private $yahooSignupPageContent;
    private $yahooSignupPageHeaders;

    public function __construct($verifierEmail = 'support@harlib.com', $port = 25)
    {
        $this->debug = array();
        $this->debugRaw = array();

        if (!is_null($verifierEmail)) {
            Log::info('[' . __METHOD__ . '] Initialized with Verifier Email: ' . $verifierEmail . ', Port: ' . $port);
            $this->setVerifierEmail($verifierEmail);
        } else {
            Log::error('[' . __METHOD__ . '] Initialized with verifier email values');
        }

        $this->setPort($port);
    }


    private function setVerifierEmail($email)
    {
        $this->verifierEmail = $email;
        Log::info('[' . __METHOD__ . '] Verifier Email was set to ' . $email);
    }

    public function getVerifierEmail()
    {
        return $this->verifierEmail;
    }

    private function setEmail($email)
    {
        $this->email = $email;
        Log::info('[' . __METHOD__ . '] Email was set to ' . $email);
    }

    public function getEmail()
    {
        return $this->email;
    }

    public function setPort($port)
    {
        $this->port = $port;
        Log::info('[' . __METHOD__ . '] Port was set to ' . $port);
    }

    public function getPort()
    {
        return $this->port;
    }

    public function getDebug($raw = false)
    {
        if ($raw) {
            return $this->debugRaw;
        } else {
            return $this->debug;
        }
    }

    public function verify($email)
    {
        $this->setEmail($email);
        Log::info('[' . __METHOD__ . '] Verifying email...');
        $is_valid = false;

        //check if this is a yahoo email
        $domain = $this->getDomain($this->email);
        if (strtolower(trim($domain)) == 'yahoo.com') {
            $is_valid = $this->validateYahoo();

        } else {//otherwise check the normal way
            //find mx
            Log::info('[' . __METHOD__ . '] Finding MX record...');
            $this->findMx();

            if (!$this->mx) {
                Log::error('[' . __METHOD__ . '] 100: No suitable MX records found');
                return $is_valid;
            } else {
                Log::info('[' . __METHOD__ . '] Found MX: ' . $this->mx);
            }

            Log::info('[' . __METHOD__ . '] Connecting to the server...');
            $this->connectMx();

            if (!$this->connect) {
                Log::error('[' . __METHOD__ . '] 110: Connection to server failed.');
                return $is_valid;
            } else {
                Log::info('[' . __METHOD__ . '] Connection to server was successful.');
            }


            Log::info('[' . __METHOD__ . '] Starting verification...');
            if (preg_match("/^220/i", $out = fgets($this->connect))) {
                Log::info('[' . __METHOD__ . '] Got a 220 response. Sending HELO...');
                fputs($this->connect, "HELO " . $this->getDomain($this->verifierEmail) . "\r\n");
                $out = fgets($this->connect);
                $this->debugRaw['helo'] = $out;
                Log::info('[' . __METHOD__ . '] Response: ' . $out);

                Log::info('[' . __METHOD__ . '] Sending MAIL FROM...');
                fputs($this->connect, "MAIL FROM: <" . $this->verifierEmail . ">\r\n");
                $from = fgets($this->connect);
                $this->debugRaw['mail_from'] = $from;
                Log::info('[' . __METHOD__ . '] Response: ' . $from);

                Log::info('[' . __METHOD__ . '] Sending RCPT TO...');
                fputs($this->connect, "RCPT TO: <" . $this->email . ">\r\n");
                $to = fgets($this->connect);
                $this->debugRaw['rcpt_to'] = $to;
                Log::info('[' . __METHOD__ . '] Response: ' . $to);

                Log::info('[' . __METHOD__ . '] Sending QUIT...');
                $quit = fputs($this->connect, "QUIT");
                $this->debugRaw['quit'] = $quit;
                Log::info('[' . __METHOD__ . '] Response: ' . $quit);
                fclose($this->connect);

                Log::info('[' . __METHOD__ . '] Looking for 250 response...');
                if (!preg_match("/^250/i", $from) || !preg_match("/^250/i", $to)) {
                    Log::error('[' . __METHOD__ . '] Not found! Email is invalid.');
                    $is_valid = false;
                } else {
                    Log::info('[' . __METHOD__ . '] Found! Email is valid.');
                    $is_valid = true;
                }
            } else {
                Log::error('[' . __METHOD__ . '] Encountered an unknown response code.');
            }
        }

        return $is_valid;
    }

    private function getDomain($email)
    {
        $email_arr = explode("@", $email);
        $domain = array_slice($email_arr, -1);
        return $domain[0];
    }

    private function findMx()
    {
        $domain = $this->getDomain($this->email);
        $mx_ip = false;
        // 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);
        }

        $mxhosts = array();
        if (filter_var($domain, FILTER_VALIDATE_IP)) {
            $mx_ip = $domain;
        } else {
            getmxrr($domain, $mxhosts, $mxweight);
        }

        if (!empty($mxhosts)) {
            $mx_ip = $mxhosts[array_search(min($mxweight), $mxweight)];
        } else {
            if (filter_var($domain, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
                $record_a = dns_get_record($domain, DNS_A);
            } 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'];
            }

        }

        $this->mx = $mx_ip;
    }


    private function connectMx()
    {
        //connect
        $this->connect = @fsockopen($this->mx, $this->port);
    }

    private function validateYahoo()
    {
        $this->debug[] = 'Validating a yahoo email address...';
        $this->debug[] = 'Getting the sign up page content...';
        $this->fetchYahooSignupPage();

        $cookies = $this->getYahooCookies();
        $fields = $this->getYahooFields();

        $this->debug[] = 'Adding the email to fields...';
        $fields['yid'] = str_replace('@yahoo.com', '', strtolower($this->email));

        $this->debug[] = 'Ready to submit the POST request to validate the email.';

        $response = $this->requestYahooAjax($cookies, $fields);

        $this->debug[] = 'Parsing the response...';
        $response_errors = json_decode($response, true)['errors'] ?? [];

        $this->debug[] = 'Searching errors for existing username error...';
        foreach ($response_errors as $err) {
            if ($err['name'] == 'yid' && $err['error'] == 'IDENTIFIER_EXISTS') {
                $this->debug[] = 'Found an error about existing email.';
                return true;
            }
        }
        return false;
    }

    private function fetchYahooSignupPage()
    {
        $this->yahooSignupPageContent = file_get_contents($this->_yahooSignupPageUrl);
        if ($this->yahooSignupPageContent === false) {
            Log::error('200: Cannot load the sign up page');
        } else {
            $this->debug[] = 'Sign up page content stored.';
            $this->debug[] = 'Getting headers...';
            $this->yahooSignupPageHeaders = $http_response_header;
            $this->debug[] = 'Sign up page headers stored.';
        }
    }

    private function getYahooCookies()
    {
        $this->debug[] = 'Attempting to get the cookies from the sign up page...';
        if ($this->yahooSignupPageContent !== false) {
            $this->debug[] = 'Extracting cookies from headers...';
            $cookies = array();
            foreach ($this->yahooSignupPageHeaders as $hdr) {
                if (preg_match('/^Set-Cookie:\s*(.*?;).*?$/', $hdr, $matches)) {
                    $cookies[] = $matches[1];
                }
            }

            if (count($cookies) > 0) {
                $this->debug[] = 'Cookies found: ' . implode(' ', $cookies);
                return $cookies;
            } else {
                $this->debug[] = 'Could not find any cookies.';
            }
        }
        return [];
        //return false;
    }

    private function getYahooFields()
    {
        $dom = new DOMDocument();
        $fields = array();
        if (@$dom->loadHTML($this->yahooSignupPageContent)) {
            $this->debug[] = 'Parsing the page for input fields...';
            $xp = new DOMXpath($dom);
            $nodes = $xp->query('//input');
            foreach ($nodes as $node) {
                $fields[$node->getAttribute('name')] = $node->getAttribute('value');
            }

            $this->debug[] = 'Extracted fields.';
        } else {
            Log::error('[' . __METHOD__ . '] 210: Could not load the dom HTML.');
        }
        return $fields;
    }

    private function requestYahooAjax($cookies, $fields)
    {
        $headers = array();
        $headers[] = 'Origin: https://login.yahoo.com';
        $headers[] = 'X-Requested-With: XMLHttpRequest';
        $headers[] = 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36';
        $headers[] = 'content-type: application/x-www-form-urlencoded; charset=UTF-8';
        $headers[] = 'Accept: */*';
        $headers[] = 'Referer: https://login.yahoo.com/account/create?specId=yidReg&lang=en-US&src=&done=https%3A%2F%2Fwww.yahoo.com&display=login';
        $headers[] = 'Accept-Encoding: gzip, deflate, br';
        $headers[] = 'Accept-Language: en-US,en;q=0.8,ar;q=0.6';

        $cookies_str = implode(' ', $cookies);
        $headers[] = 'Cookie: ' . $cookies_str;


        $postdata = http_build_query($fields);

        $opts = array(
            'http' =>
                array(
                    'method' => 'POST',
                    'header' => $headers,
                    'content' => $postdata
                )
        );

        $context = stream_context_create($opts);
        $result = file_get_contents($this->_yahooSignupAjaxUrl, false, $context);

        return $result;
    }
}