ext_localconf.php
<?php
use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
defined('TYPO3') || die();
// Add default TypoScript
ExtensionManagementUtility::addTypoScriptConstants(
"@import 'EXT:mail_logger/Configuration/TypoScript/constants.typoscript'"
);
ExtensionManagementUtility::addTypoScriptSetup(
"@import 'EXT:mail_logger/Configuration/TypoScript/setup.typoscript'"
);