Sending form to mail from custom module fails without error

Question

I've created a module with a form and a block.

When I push the subscribe button, the submitForm function is executed.

The successmessage is shown, but no e-mail is send ...

There are no errors reported in the recent logmessages or in on the server in the folder /logs.

public function submitForm(array &$form, FormStateInterface $form_state)
    {
        /**
         * @var MailManager $mailer
         */
        $mailer = \Drupal::service('plugin.manager.mail');

        $email = $form_state->getValue('email');
        $params['context']['subject'] = "Subscribe newsletter";
        $params['context']['message'] = 'Someone subscribed: ' . $email;
        $params['email'] = $email;

        try {
            $response = $mailer->mail('my_module', 'subscribe', 'to@email.com', 'nl', $params);
            if ($response) {
                $this->messenger()->addStatus($this->t('You are successfully subscribed to our newsletter with your e-mail: @email', ['@email' => $email]));
            } else {
                $this->messenger()->addStatus($this->t('There was an error.'));
            }
        } catch (MailHandlerException $e) {
            \Drupal::logger('mailinglist_send_mail_error')->notice('<pre><code>' . print_r($e, true) . '</code></pre>');
        }

    }

Answer 1

Did you implement hook_mail in your module? – Alfred Armstrong

where to place the hook_mail function? – Lance

Goes in the .module file. Ex: my_module.module

/*
* Implements hook_mail().
*/
function my_module_mail($key, &$message, $params) {
  switch($key) {     
    case 'my_module':
      $options = [
        'langcode' => $message['langcode'],
      ];
      $message['subject'] = t('@title', ['@title' => $params['context']['subject']], $options);
      $message['body'][] = t('@body', ['@body' => $params['context']['message']], $options);         
      break; 
  }
}

Flush all caches so hook gets picked up.