Symfony 3.3 and Swiftmailer - mail created and sent by controller deferred by server

Question

I'm trying to use Swiftmailer to send emails out from a website. The emails keep getting deferred because Swiftmailer is attempting to use my server's IP address rather than localhost as the relay:

Aug  2 14:18:28 picus sm-mta[21171]: v72IIS0I021171: from=<[email protected]>, size=347, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1]
Aug  2 14:18:28 picus sm-mta[21173]: v72IIS0I021171: to=<[email protected]>, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=120347, relay=example.com. [my.servers.ip.address], dsn=4.0.0, stat=Deferred: Connection refused by example.com.

My Symfony controller code, config, and parameters -

Relevant controller code:

if ($form->isSubmitted() && $form->isValid()) {
    $data = $form->getData();

    $this->addFlash('success', 'Message sent successfully');

    $data['message'] = str_replace("\n.", "\n..", $data['message']);

    $mail = (new \Swift_Message())
        ->setSubject("[From My Website] - {$data['subject']}")
        ->setFrom($data['email'])
        ->setTo('[email protected]')
        ->setBody("{$data['name']} wrote the following message:\n\n{$data['message']}");

    $this->get('mailer')->send($mail);

    return $this->redirect($this->generateUrl('_home'));
}

config.yml:

# Swiftmailer Configuration
swiftmailer:
    transport: '%mailer_transport%'
    host: '%mailer_host%'
    username: '%mailer_user%'
    password: '%mailer_password%'
    port: '%mailer_port%'
    spool:
        type: file
        path: '%kernel.cache_dir%/swiftmailer/spool'

parameters.yml:

parameters:
    mailer_transport: sendmail
    mailer_host: 127.0.0.1
    mailer_user: null
    mailer_password: null
    mailer_port: null

What's really frustrating is that if I create a message using bin/console swiftmailer:email:send, and then flush the spool (bin/console swiftmailer:spool:send) it is sent properly. It's only when I create and send a message through my controller that there's an issue.

What am I doing wrong?

Answer 1

Ooof

It was a DNS error on my side that was causing the problem. Namely, that I forgot to point my MX records to Google's mail servers, so sendmail was taking the example.com portion of the destination address and trying to use it as a smtp relay, even though I didn't have a mail server set up.

Apologies for all the consternation. Hopefully my answer can be useful for others banging their heads against the wall.

Answer 2

Why do you use the Sendmail Transport instead of SMTP Transport?

https://swiftmailer.symfony.com/docs/sending.html

Try this:

config.yml

# Swiftmailer Configuration
swiftmailer:
    transport: "%mailer_transport%"
    host:      "%mailer_host%"
    username:  "%mailer_user%"
    password:  "%mailer_password%"
    port: "%mailer_port%"
    encryption: "%mailer_encryption%"
    spool:     { type: memory }

parameters.yml

parameters:
    mailer_transport: smtp
    mailer_host: smtp.office365.com
    mailer_user: [email protected]
    mailer_password: my_password
    mailer_port: 587
    mailer_encryption: tls

Controller

$message = \Swift_Message::newInstance()
            ->setSubject('Subject')
            ->setFrom(array('[email protected]' => 'My name'))
            ->setTo(array($user->getMail()))
            ->setBcc(array('[email protected]', '[email protected]'))
            ->setBody(
                $this->renderView(
                    'template.html.twig',
                    array('vars' => $vars)
                ),
                'text/html'
            );

$this->get('mailer')->send($message);

Answer 3

I can suggest you to try this approach:

    $mailer = $container->get('mailer');
    $spool = $mailer->getTransport()->getSpool();
    $transport = $container->get('swiftmailer.transport.real');

    $sender     = 'your_sender';
    $recipient  = 'your_recipient';
    $title      = 'your_title';
    $body       = 'your_message';
    $charset    = "UTF-8";

    $email = $mailer->createMessage()
        ->setSubject($title)
        ->setFrom("$sender")
        ->setTo("$recipient")
        ->setCharset($charset)
        ->setContentType('text/html')
        ->setBody($body)
    ;

    $send = $mailer->send($email);
    $spool->flushQueue($transport);

You can wrap this into a send message of the simple YouMailService. Or you can insert this code into your controller. This will be enough.