Symfony confirmation email not send but gmail work - swiftmailer

Question

i have some probleme using swiftmailer for setting my confirmation email, normaly everything is set well, but the mail is not sent, and i have my user in my database (but enable is set to 0 of course).
Since i don't have errors show by symfony i suppose it's my gmail account that blocked them, but i already set it to allow other application to use it as a "server", and i have a page that use swiftmailer to send normal mail, and it work fine.
i'm lost, thanks for your future help
My config.yml :
swiftmailer:
transport: %mailer_transport%
host: %mailer_host%
username: %mailer_user%
password: %mailer_password%
encryption: ssl
fos_user:
db_driver: orm
firewall_name: main
user_class: UserBundle\Entity\User
service:
mailer: fos_user.mailer.default
registration:
confirmation:
enabled: true
from_email:
address: maxime.duvey#gmail.com
sender_name: Registration mail
My config.yml :
mailer_transport: gmail
mailer_host: 127.0.0.1
mailer_user: maxime.duvey#gmail.com
mailer_password: XXXXXXXXXXX
i'm really lost, i don't understand why it don't work

Answer 1

It might be because you have to turn on "Less Secure Apps" as gmail allows doesn't allow you to access logins unless it is a secure app that they provide. This can be found in you google admin console.
See the link here for more info
I had the same problem when using PHPMailer.
However if you do decide to turn it on, it is not recommended.
They mention this in the link provided.

Answer 2

now that i think of it, it's maybe my manner to add a new user to my database :
my controler :
$userregister = new User();
$formregister = $this->get('form.factory')->createBuilder(FormType::class, $userregister);
$formregister
->add('firstname', TextType::class)
->add('lastname', TextType::class)
->add('email', EmailType::class)
->add('phonehome', NumberType::class)
->add('phoneportable', NumberType::class)
->add('username', TextType::class)
//->add('Password', PasswordType::class)
->add('plainPassword', RepeatedType::class, array(
'type' => PasswordType::class,
'first_options' => array('label' => 'Password'),
'second_options' => array('label' => 'Repeat Password'),
))
->add('submit', SubmitType::class);
$form = $formregister->getForm();
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid())
{
$em = $this->getDoctrine()->getManager();
$em->persist($userregister);
$em->flush();
$request->getSession()->getFlashBag()->add('notice', 'Annonce bien enregistrée.');
return $this->redirect($this->generateUrl('Contact_Action', array('id' => $userregister->getId())));
}
return $this->render('register.html.twig', array('form'=>$form->createView()));
and my twig :
{{ form(form) }}
i'm not sure, maybe