Где в yii2 указан порт отправки писем?

'components' => [
 *         'mailer' => [
 *             'class' => 'yii\swiftmailer\Mailer',
 *             'transport' => [
 *                 'class' => 'Swift_SmtpTransport',
 *                 'host' => 'localhost',
 *                 'username' => 'username',
 *                 'password' => 'password',
 *                 'port' => '587',
 *                 'encryption' => 'tls',
 *             ],
 *         ],
 *         // ...
 *     ],