MailerInterface is not working

[harrydeboer]

Symfony version(s) affected

7.0.8

Description

I am sending mail using the MailerInterface. Sending mail gives no error but the mail is not delivered. When I am using the Mailer and Transport classes directly the mail is delivered. This behavior exists since I use Symfony 7.

How to reproduce

.env.local
MAILER_DSN=smtp://USERNAME:APP_PASSWORD@smtp.example.com:000

use Symfony\Component\Mailer\MailerInterface;

public function __construct( private readonly MailerInterface $mailer, ) { }

$email = (new Email()) ->from(new Address('postmaster@example.com', strip_tags($form->get('name')->getData()))) ->replyTo($form->get('email')->getData()) ->to('info@example.com') ->subject(strip_tags($form->get('subject')->getData())) ->html($form->get('message')->getData());

$this->mailer->send($email);

The send method of mailer gives no exception but the mail is not delivered.

Possible Solution

When I explicitly set the transport to the mailer it mails correctly:

use Symfony\Component\Mailer\Mailer;
use Symfony\Component\Mailer\Transport;

            $transport = Transport::fromDsn($this->getParameter('mailer_dsn'));
            $mailer = new Mailer($transport);

$email = (new Email()) ->from(new Address('postmaster@example.com', strip_tags($form->get('name')->getData()))) ->replyTo($form->get('email')->getData()) ->to('info@example.com') ->subject(strip_tags($form->get('subject')->getData())) ->html($form->get('message')->getData());

$mailer->send($email);

Additional Context

No response

[xabbuh]

Can you create a small example application that allows to reproduce your issue?

[harrydeboer]

Create a new project: composer create-project symfony/skeleton:"7.0.*" project
then in project:
composer require webapp

Add the following to services.yaml
parameters:
mailer_dsn: '%env(MAILER_DSN)%'

Make a local env file:
.env.local

APP_ENV=dev
APP_SECRET=secret
DB_USERNAME=root
DB_PASSWORD=secret
MYSQL_ROOT_PASSWORD=${DB_PASSWORD}
MYSQL_PASSWORD=${DB_PASSWORD}
DB_DATABASE=mailbug
DB_HOST=localhost
DB_CONNECTION=mysql
DB_PORT=3306
DATABASE_URL="${DB_CONNECTION}://${DB_USERNAME}:${DB_PASSWORD}@${DB_HOST}:${DB_PORT}/${DB_DATABASE}?serverVersion=8.0.37"
MAILER_DSN=smtp://info@example.com:APP-PASSWORD@smtp.gmail.com:587

From a controller I can send the email.

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Mailer\Mailer;
use Symfony\Component\Mailer\MailerInterface;
use Symfony\Component\Mailer\Transport;
use Symfony\Component\Mime\Address;
use Symfony\Component\Mime\Email;
use Symfony\Component\Routing\Attribute\Route;

class Controller extends AbstractController
{
public function __construct( private readonly MailerInterface $mailer, ) { }

#[ Route('/', name: 'homepage'), ] public function view(): Response
{
$email = (new Email()) ->from(new Address('postmaster@example.com', 'John')) ->replyTo('john@test.com') ->to('info@example.com') ->subject('Test') ->html('Test');

$this->mailer->send($email);

return new Response();
}
}

it sends no email now, but when I change the code to:

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Mailer\Mailer;
use Symfony\Component\Mailer\MailerInterface;
use Symfony\Component\Mailer\Transport;
use Symfony\Component\Mime\Address;
use Symfony\Component\Mime\Email;
use Symfony\Component\Routing\Attribute\Route;

class Controller extends AbstractController
{
public function __construct( private readonly MailerInterface $mailer, ) { }

#[ Route('/', name: 'homepage'), ] public function view(): Response
{
$transport = Transport::fromDsn($this->getParameter('mailer_dsn'));
$mailer = new Mailer($transport);

$email = (new Email()) ->from(new Address('postmaster@example.com', 'John')) ->replyTo('john@test.com') ->to('info@example.com') ->subject('Test') ->html('Test');

$mailer->send($email);

return new Response();
}
}

Using the Transport in the Mailer directly makes the mailing work.

[MatTheCat]

composer require webapp will install symfony/messenger so it may be that by default your emails are sent as messages to a bus.

[sfmok]

Based on Mailer component doc and as @MatTheCat mentioned:

if your application has the Messenger component installed, all emails will be sent asynchronously by default

This mean emails are end up as messages to the bus but you can change that https://symfony.com/doc/current/messenger.html#messenger-handling-messages-synchronously