'mailer' => [
            'useFileTransport' => false,
            'transport' => [
                'class' => 'Swift_SmtpTransport',
                'host' => 'smtp.yandex.ru',
                'username' => 'мыло для домена',
                'password' => 'пароль',
                'port' => '25',
                'encryption' => 'tls',
            ],
        ],