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Edit File: Blacklist.php

<?php // phpcs:ignore SlevomatCodingStandard.TypeHints.DeclareStrictTypes.DeclareStrictTypesMissing

namespace MailPoet\Subscription;

if (!defined('ABSPATH')) exit;

class Blacklist {
  const SALT = 'mailpoet';

private $blacklistedEmails = [
    'e60c6e0e73997c92d4ceac78a6b6cbbe6249244c4106a3c31de421fc50370ecd' => 1,
    '4a7fb8fba0a800ad5cf324704d3510d019586765aef6d5081fa5aed3f93d9dce' => 1,
    '7151c278028263ace958b66616e69a438f23e5058a5df42ed734e9e6704f8332' => 1,
  ];

private $blacklistedDomains = [
    '2ea570cf0c440b2ec7d6e1335108625a5f62162b2116a25c9c909dc5b54c213f' => 1,
    '1e10eb32b615217baa4d8f54191891e107851a2057d1128f067f1df096896e45' => 1,
    'dc2bfb04e38d3c25c8a465a5fed841a1cb1685044d12241efe01f0fc044f2182' => 1,
    'f17c13fe5a1d8cd2e78a04528377cc607881ad12b6295b6fa8b6a789d1d04c10' => 1,
    '813cbef72da3542e783470ecd62589bceb3883d15ab2435ec2486f9762602b8c' => 1,
  ];

public function __construct(
    ?array $blacklistedEmails = null,
    ?array $blacklistedDomains = null
  ) {
    if ($blacklistedEmails) {
      $this->blacklistedEmails = array_fill_keys(array_map([$this, 'hash'], $blacklistedEmails), 1);
    }
    if ($blacklistedDomains) {
      $this->blacklistedDomains = array_fill_keys(array_map([$this, 'hash'], $blacklistedDomains), 1);
    }
  }

public function isBlacklisted($email) {
    $hashedEmail = $this->hash($email);
    if (isset($this->blacklistedEmails[$hashedEmail])) {
      return true;
    }
    $emailParts = explode('@', $email);
    $domain = end($emailParts);
    $hashedDomain = $this->hash($domain);
    return isset($this->blacklistedDomains[$hashedDomain]);
  }

private function hash($key) {
    return hash('sha256', $key . self::SALT);
  }
}

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