diff --git a/Classes/Service/RegisterService.php b/Classes/Service/RegisterService.php
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+++ b/Classes/Service/RegisterService.php
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+<?php
+
+namespace SGalinski\SgMail\Service;
+
+/***************************************************************
+ *  Copyright notice
+ *
+ *  (c) sgalinski Internet Services (https://www.sgalinski.de)
+ *
+ *  All rights reserved
+ *
+ *  This script is part of the TYPO3 project. The TYPO3 project is
+ *  free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  The GNU General Public License can be found at
+ *  http://www.gnu.org/copyleft/gpl.html.
+ *
+ *  This script 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 General Public License for more details.
+ *
+ *  This copyright notice MUST APPEAR in all copies of the script!
+ ***************************************************************/
+
+use TYPO3\CMS\Core\Cache\CacheManager;
+use TYPO3\CMS\Core\Cache\Frontend\FrontendInterface;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * Class RegisterService
+ *
+ * @package SGalinski\SgMail\Service
+ */
+class RegisterService implements \TYPO3\CMS\Core\SingletonInterface {
+	const CACHE_NAME = 'sg_mail_registerArrayCache';
+	const CACHE_LIFETIME_IN_SECONDS = 86400;
+
+	/**
+	 * @var array
+	 */
+	public $registerArray = [];
+
+	/**
+	 * @var array
+	 */
+	private $registrationFiles = [];
+
+	/**
+	 * Enables extensions to add their registration files
+	 *
+	 * @param string $pathToRegisterFile
+	 */
+	public function register($pathToRegisterFile) {
+		if (file_exists($pathToRegisterFile)) {
+			$this->registerArray[] = [
+				'path' => $pathToRegisterFile
+			];
+		}
+	}
+
+	/**
+	 * Get all registered templates from the cache
+	 *
+	 * @return array
+	 * @throws \TYPO3\CMS\Core\Cache\Exception\NoSuchCacheException
+	 * @throws \BadFunctionCallException
+	 * @throws \InvalidArgumentException
+	 */
+	public function getRegisterArray(): array {
+		/** @var CacheManager $cacheManager */
+		$cacheManager = GeneralUtility::makeInstance(CacheManager::class);
+		/** @var FrontendInterface $cache */
+		$cache = $cacheManager->getCache(self::CACHE_NAME);
+		$cacheId = md5('sg_mail');
+		/** @var array entry */
+		if (($entry = $cache->get($cacheId)) === FALSE) {
+			$entry = $this->registerExtensions();
+
+			if ($entry === NULL) {
+				$entry = [];
+			}
+
+			$cache->set($cacheId, $entry, [], self::CACHE_LIFETIME_IN_SECONDS);
+		}
+
+		return $entry;
+	}
+
+	/**
+	 * 
+	 */
+	private function registerExtensions() {
+
+	}
+}
+