If the Database Logging module is disabled (for instance on a Production environment), an unexpected error page displays and when a test email is submitted from /admin/config/system/phpmailer.
The email does indeed send, but you don't get the usual "A test email has been sent" message, just an error.
We looked through our logs and saw the following:
Symfony\Component\Routing\Exception\RouteNotFoundException: Route "dblog.overview" does not exist. in Drupal\Core\Routing\RouteProvider->getRouteByName() (line 201 of /mnt/www/html/project/docroot/core/lib/Drupal/Core/Routing/RouteProvider.php).
It appears that PHPMailer is hardcoding that route. After searching the module for dblog.overview, we found the following in /src/Form/SettingsForm.php:
264| /**
265| * {@inheritdoc}
266| */
267| public function submitForm(array &$form, FormStateInterface $form_state) {
268| $values = $form_state->getValues();
...snip...
330| /**
331| * @todo This part needs to be figured out.
332| */
333| // Send a test email message, if an email address was entered.
334| if ($values['phpmailer_test']) {
335| // Since this is being sen to an email address that may not necessarily be
336| // tied to a user account, use the site's default language.
337| $langcode = $this->languageManager->getDefaultLanguage()->getId();
338| // If PHPMailer is enabled, send via regular drupal_mail().
339| if (phpmailer_active()) {
340|// $this->mailManager->mail('phpmailer', 'test', $values['phpmailer_test'], $language_code, $params, $from, $send_now);
341| \Drupal::service('plugin.manager.mail')->mail('phpmailer', 'test', $values['phpmailer_test'], $langcode);
342| }
343| // Otherwise, prepare and send the test mail manually.
344| else {
345| // Prepare the message without sending.
346| $message = \Drupal::service('plugin.manager.mail')->mail('phpmailer', 'test', $values['phpmailer_test'], $langcode, [], NULL, FALSE);
347| // Send the message.
348| module_load_include('inc', 'phpmailer', 'includes/phpmailer.drupal');
349| $ret_val = phpmailer_send($message);
350| }
351| $watchdog_url = Url::fromRoute('dblog.overview');
352| $watchdog_url = \Drupal::l(t('Check the logs'), $watchdog_url);
353| drupal_set_message(t('A test e-mail has been sent to %email. @watchdog-url for any error messages.', [
354| '%email' => $values['phpmailer_test'],
355| '@watchdog-url' => $watchdog_url,
356| ]));
357| }
Line 351 specifically tries to request the route to dblog.overview, regardless of whether or not the module is enabled which may be causing this issue.
Extra Info:
Using PHPMailer 8.x-3.0-beta2
Do you use Google Mail to send e-mails? No.
Fixed
3.0
Code
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Issue #3018666 - Add module validation
Automatically closed - issue fixed for 2 weeks with no activity.