some big beautiful update

application/Espo/Core/Mail/Account/Util/AddressUtil.php

@@ -0,0 +1,69 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Mail\Account\Util;
+
+use Espo\Core\Mail\Account\Storage\Params;
+use Espo\Core\Mail\SmtpParams;
+use Espo\Core\Utils\Config;
+
+/**
+ * @internal
+ */
+class AddressUtil
+{
+    public function __construct(
+        private Config $config,
+    ) {}
+
+    /**
+     * @internal
+     */
+    public function isAllowedAddress(Params|SmtpParams $params): bool
+    {
+        $host = $params instanceof Params ? $params->getHost() : $params->getServer();
+        $port = $params->getPort();
+
+        if ($port === null || !$host) {
+            return false;
+        }
+
+        $address = $host . ':' . $port;
+
+        return in_array($address, $this->getAllowedAddressList());
+    }
+
+    /**
+     * @return string[]
+     */
+    private function getAllowedAddressList(): array
+    {
+        return $this->config->get('emailServerAllowedAddressList') ?? [];
+    }
+}