mailer_transport: smtp
mailer_encryption: ssl
mailer_port: 465
mailer_host: auth.smtp.1and1.fr
mailer_user: email@mondoamine
mailer_password: mot de passe

MAILER_URL=Mydomaine

/**
 * @Route("/contact")
 * @param Request $request
 * @return Response
 */
public function contact(Request $request, Swift_Mailer $mailer): Response {

    $form = $this->createForm(ContactType::class);
    $form->handleRequest($request);
    if($form->isSubmitted() && $form->isValid()) {
        $contact = $form->getData();
        $message = (new Swift_Message($contact['subject']))
            ->setFrom($contact['email'])
            ->setTo('crowbackend@gmail.com')
            ->setBody(
                $contact['message'],
                'text/plain'
            );
        $mailer->send($message);

        $this->addFlash('notice', 'Le méssage a bien étais envoyer vous allez recevoir une réponse d'ici 48h' );

        return $this->redirectToRoute('app_front_index');
    }

    return $this->render('contact.html.twig', [
        'title' => 'Contacter Nous',
        'description' => 'Contacter nous a tout moment si vous avez des questions',
        'keywords' => 'Contact, monCpf, info',
        'formContact' => $form->createView()
    ]);
}