Why MaxAttemptsExceededException - laravel

Question

I don't think I understand Laravel's queue system.
I implemented Redis (basic configuration) and I am doing very basic testing, but this error MaxAttemptsExceededExceptionis causing me a lot of confusion.
The idea of this "test" would be to simply run the controller via the browser, and as the controller runs, it "dispatches" the job, inside the for loop. In this test, I aim to send 1 email every 25 seconds, I imagine that each time I run the controller, the emails are "stacked".
Initially everything runs, but suddenly, php artisan queue:work reports error.
The point is:
What is the reason for this timeout? Is it a delay of Redis?
Is this parameter correct to use queue:work --tries=3?
Are there any settings I should change?
.ENV
CACHE_DRIVER=redis
QUEUE_CONNECTION=redis
SESSION_DRIVER=redis
SESSION_CONNECTION=default
CONFIG / DATABASE.PHP
'redis' => [
'client' => 'predis',
'default' => [
'host' => env('REDIS_HOST', '127.0.0.1'),
'password' => env('REDIS_PASSWORD', null),
'port' => env('REDIS_PORT', 6379),
'database' => env('REDIS_DB', 0),
],
'cache' => [
'host' => env('REDIS_HOST', '127.0.0.1'),
'password' => env('REDIS_PASSWORD', null),
'port' => env('REDIS_PORT', 6379),
'database' => env('REDIS_CACHE_DB', 1),
],
],
CONFIG / SESSION.PHP
'connection' => env('SESSION_CONNECTION', null),
MY CONTROLLER
for ($i = 1; $i <= 5; $i++)
{
$when = now()->addSeconds(25 * $i);
$mykey = 'KEY--' . $i . '--' . $when->toDateTimeString();
dispatch(new TestRedisJob($mykey));
}
MY JOB CLASS (TestRedisJob)
public function handle(Redis $redis)
{
Redis::throttle('email')->allow(1)->every(25)->then(function ()
{
\Mail::to('customer#domain.com')
->send(new OrderShipped('contato#fiscalizo.com.br', $this->mykey));
}, function() {
return $this->release(25);
});
MY MAILABLE CLASS (OrderShipped)
public function build()
{
return $this
->from($this->emailFrom)
->subject("Registro Efetivado: " . $this->emailSubject)
->view('emails.welcome');