Yii 2 mailer dont send mail and dont display errors

[nnpa]

config 'components' => [ 'mailer' => [ 'class' => 'yii\swiftmailer\Mailer', 'transport' => [ 'class' => 'Swift_SmtpTransport', 'host' => 'smtp.send-box.ru', 'username' => '[email protected]', 'password' => 'password', 'port' => '587', 'encryption' => 'tls', ], ],

    Yii::$app->mailer->compose()
    ->setFrom('[email protected]')
    ->setTo('[email protected]')
    ->setSubject('Тема сообщения')
    ->setTextBody('Текст сообщения')
    ->setHtmlBody('<b>текст сообщения в формате HTML</b>')
    ->send();

code return true witout errors (when config has errors) mail not send Why?