<?php
/** @var \TYPO3\CMS\Extbase\SignalSlot\Dispatcher $signalSlotDispatcher */
$signalSlotDispatcher = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
    \TYPO3\CMS\Extbase\SignalSlot\Dispatcher::class
);
$signalSlotDispatcher->connect(
    'TYPO3\\CMS\\Core\\Mail\\Mailer', 'postInitializeMailer',
    'Mogic\\Extname\\MailLogger', 'postInitializeMailer'
);
?>