Can't send mail with Gmail - php

Question

I'm trying to send an email when a user is subscribing in my web site.
To save me time ... I'm using Swift_Mailer with Symfony.
First, I tried to send a mail with the console :
php .\bin\console swiftmailer:email:send
And that's working, the mail was sent and the client received it.
So now I said to myself, I will be able to send emails with the code.
That's my Controller code :
public function register(Request $request, \Swift_Mailer $mailer)
{
// Here saving new user in the database
$this->sendMail($user->getEMail(), $mailer);
$content = $this->renderView("register.html.twig");
return new Response($content);
}
private function sendMail($email, \Swift_Mailer $mailer)
{
$message = (new \Swift_Message('Hello Email'))
->setFrom(['my.email#gmail.com' => "my name"])
->setTo($email)
->setBody('Here is the message itself');
$mailer->send($message);
}
And That's my .env file :
MAILER_URL=gmail://my.email#gmail.com:myPasswordHere#localhost
When I'm trying to send the mail, no error, I tried this StackOverflow link, but no problem, echo "Successfull", but nothing in the Gmail send box and nothing my client email box.
Can you please help me to ... save me time ^^
------------------------------------------------------------- EDIT 1 ------------------------------------------------------------
I never edited the config/packages/swiftmailer.yaml file, that's it's content :
swiftmailer:
url: '%env(MAILER_URL)%'
spool: { type: 'memory' }
------------------------------------------------------------- EDIT 2 ------------------------------------------------------------
I also tryed to make a new transporter with this code :
$transport = (new \Swift_SmtpTransport('smtp.gmail.com', 465))
->setUsername('my.email#gmail.com')
->setPassword('myPasswordHere');
$mailer = new \Swift_Mailer($transport);
And that's the error I get : Connection could not be established with host smtp.gmail.com [php_network_getaddresses: getaddrinfo failed: Unknown host. #0]
------------------------------------------------------------- EDIT 3 ------------------------------------------------------------
I've got a swiftmailer.yaml fil in the config/packages/dev folder and that's it's default content :
# See https://symfony.com/doc/current/email/dev_environment.html
swiftmailer:
# send all emails to a specific address
#delivery_addresses: ['me#example.com']
I tried to put the same content as in the config/packages/swiftmailer.yaml, but no result.

Answer 1

I don't see something like this in your code:
// Create the Transport
$transport = (new \Swift_SmtpTransport('mail hoster etc', port))
->setUsername('your email')
->setPassword('your password');
// Create the Mailer using your created Transport
$mailer = new \Swift_Mailer($transport);
Maybe it's a reason why your mails isn't sent.