add queue_mail module

composer.json

@@ -144,6 +144,7 @@
         "drupal/pantheon_advanced_page_cache": "1.2",
         "drupal/paragraphs": "1.12",
         "drupal/pathauto": "1.8",
+        "drupal/queue_mail": "^1.4",
         "drupal/rebuild_cache_access": "1.7",
         "drupal/recaptcha": "3.0",
         "drupal/recaptcha_v3": "^1.4",

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "8ac8778d5044260fcd494ebe07b01805",
+    "content-hash": "39b546aa80d3dd2636b7dd5693e7c94e",
     "packages": [
         {
             "name": "alchemy/zippy",
@@ -6176,6 +6176,65 @@
                 "documentation": "https://www.drupal.org/docs/8/modules/pathauto"
             }
         },
+        {
+            "name": "drupal/queue_mail",
+            "version": "1.4.0",
+            "source": {
+                "type": "git",
+                "url": "https://git.drupalcode.org/project/queue_mail.git",
+                "reference": "8.x-1.4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://ftp.drupal.org/files/projects/queue_mail-8.x-1.4.zip",
+                "reference": "8.x-1.4",
+                "shasum": "ccc3603d084017ec4d3aa67fa60da171ef8d63b8"
+            },
+            "require": {
+                "drupal/core": "^8.8.0 || ^9.0"
+            },
+            "type": "drupal-module",
+            "extra": {
+                "drupal": {
+                    "version": "8.x-1.4",
+                    "datestamp": "1632316348",
+                    "security-coverage": {
+                        "status": "covered",
+                        "message": "Covered by Drupal's security advisory policy"
+                    }
+                }
+            },
+            "notification-url": "https://packages.drupal.org/8/downloads",
+            "license": [
+                "GPL-2.0-or-later"
+            ],
+            "authors": [
+                {
+                    "name": "Evgenii Nikitin (sinn)",
+                    "homepage": "https://www.drupal.org/u/sinn",
+                    "role": "Maintainer"
+                },
+                {
+                    "name": "Steven Jones",
+                    "homepage": "https://www.drupal.org/user/99644",
+                    "role": "Maintainer"
+                },
+                {
+                    "name": "sinn",
+                    "homepage": "https://www.drupal.org/user/682600"
+                },
+                {
+                    "name": "wafaa",
+                    "homepage": "https://www.drupal.org/user/50133"
+                }
+            ],
+            "description": "Queues all mail sent by your Drupal site so that it is sent via cron using the Drupal Queue API.",
+            "homepage": "http://drupal.org/project/queue_mail",
+            "support": {
+                "source": "https://git.drupalcode.org/project/queue_mail",
+                "issues": "https://www.drupal.org/project/issues/queue_mail"
+            }
+        },
         {
             "name": "drupal/rebuild_cache_access",
             "version": "1.7.0",

vendor/composer/autoload_classmap.php

@@ -2258,8 +2258,6 @@
     'Drupal\\Core\\Language\\LanguageManager' => $baseDir . '/web/core/lib/Drupal/Core/Language/LanguageManager.php',
     'Drupal\\Core\\Language\\LanguageManagerInterface' => $baseDir . '/web/core/lib/Drupal/Core/Language/LanguageManagerInterface.php',
     'Drupal\\Core\\Layout\\Annotation\\Layout' => $baseDir . '/web/core/lib/Drupal/Core/Layout/Annotation/Layout.php',
-    'Drupal\\Core\\Layout\\Icon\\IconBuilderInterface' => $baseDir . '/web/core/lib/Drupal/Core/Layout/Icon/IconBuilderInterface.php',
-    'Drupal\\Core\\Layout\\Icon\\SvgIconBuilder' => $baseDir . '/web/core/lib/Drupal/Core/Layout/Icon/SvgIconBuilder.php',
     'Drupal\\Core\\Layout\\LayoutDefault' => $baseDir . '/web/core/lib/Drupal/Core/Layout/LayoutDefault.php',
     'Drupal\\Core\\Layout\\LayoutDefinition' => $baseDir . '/web/core/lib/Drupal/Core/Layout/LayoutDefinition.php',
     'Drupal\\Core\\Layout\\LayoutInterface' => $baseDir . '/web/core/lib/Drupal/Core/Layout/LayoutInterface.php',

vendor/composer/autoload_static.php

@@ -3049,8 +3049,6 @@ class ComposerStaticInit5c689ffcd54b9e495ed983fdce09b530
         'Drupal\\Core\\Language\\LanguageManager' => __DIR__ . '/../..' . '/web/core/lib/Drupal/Core/Language/LanguageManager.php',
         'Drupal\\Core\\Language\\LanguageManagerInterface' => __DIR__ . '/../..' . '/web/core/lib/Drupal/Core/Language/LanguageManagerInterface.php',
         'Drupal\\Core\\Layout\\Annotation\\Layout' => __DIR__ . '/../..' . '/web/core/lib/Drupal/Core/Layout/Annotation/Layout.php',
-        'Drupal\\Core\\Layout\\Icon\\IconBuilderInterface' => __DIR__ . '/../..' . '/web/core/lib/Drupal/Core/Layout/Icon/IconBuilderInterface.php',
-        'Drupal\\Core\\Layout\\Icon\\SvgIconBuilder' => __DIR__ . '/../..' . '/web/core/lib/Drupal/Core/Layout/Icon/SvgIconBuilder.php',
         'Drupal\\Core\\Layout\\LayoutDefault' => __DIR__ . '/../..' . '/web/core/lib/Drupal/Core/Layout/LayoutDefault.php',
         'Drupal\\Core\\Layout\\LayoutDefinition' => __DIR__ . '/../..' . '/web/core/lib/Drupal/Core/Layout/LayoutDefinition.php',
         'Drupal\\Core\\Layout\\LayoutInterface' => __DIR__ . '/../..' . '/web/core/lib/Drupal/Core/Layout/LayoutInterface.php',

vendor/composer/installed.json

@@ -6413,6 +6413,68 @@
             },
             "install-path": "../../web/modules/pathauto"
         },
+        {
+            "name": "drupal/queue_mail",
+            "version": "1.4.0",
+            "version_normalized": "1.4.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://git.drupalcode.org/project/queue_mail.git",
+                "reference": "8.x-1.4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://ftp.drupal.org/files/projects/queue_mail-8.x-1.4.zip",
+                "reference": "8.x-1.4",
+                "shasum": "ccc3603d084017ec4d3aa67fa60da171ef8d63b8"
+            },
+            "require": {
+                "drupal/core": "^8.8.0 || ^9.0"
+            },
+            "type": "drupal-module",
+            "extra": {
+                "drupal": {
+                    "version": "8.x-1.4",
+                    "datestamp": "1632316348",
+                    "security-coverage": {
+                        "status": "covered",
+                        "message": "Covered by Drupal's security advisory policy"
+                    }
+                }
+            },
+            "installation-source": "dist",
+            "notification-url": "https://packages.drupal.org/8/downloads",
+            "license": [
+                "GPL-2.0-or-later"
+            ],
+            "authors": [
+                {
+                    "name": "Evgenii Nikitin (sinn)",
+                    "homepage": "https://www.drupal.org/u/sinn",
+                    "role": "Maintainer"
+                },
+                {
+                    "name": "Steven Jones",
+                    "homepage": "https://www.drupal.org/user/99644",
+                    "role": "Maintainer"
+                },
+                {
+                    "name": "sinn",
+                    "homepage": "https://www.drupal.org/user/682600"
+                },
+                {
+                    "name": "wafaa",
+                    "homepage": "https://www.drupal.org/user/50133"
+                }
+            ],
+            "description": "Queues all mail sent by your Drupal site so that it is sent via cron using the Drupal Queue API.",
+            "homepage": "http://drupal.org/project/queue_mail",
+            "support": {
+                "source": "https://git.drupalcode.org/project/queue_mail",
+                "issues": "https://www.drupal.org/project/issues/queue_mail"
+            },
+            "install-path": "../../web/modules/queue_mail"
+        },
         {
             "name": "drupal/rebuild_cache_access",
             "version": "1.7.0",

vendor/composer/installed.php

@@ -5,7 +5,7 @@
         'type' => 'project',
         'install_path' => __DIR__ . '/../../',
         'aliases' => array(),
-        'reference' => '12c2eafc0e95f979c96849005ecf8e09d6dcb2ae',
+        'reference' => 'd2ba02375d2963b4d365129930f11ab04573ee3e',
         'name' => 'osu-asc-webservices/d8-upstream',
         'dev' => true,
     ),
@@ -1414,6 +1414,15 @@
             'reference' => '8.x-1.8',
             'dev_requirement' => false,
         ),
+        'drupal/queue_mail' => array(
+            'pretty_version' => '1.4.0',
+            'version' => '1.4.0.0',
+            'type' => 'drupal-module',
+            'install_path' => __DIR__ . '/../../web/modules/queue_mail',
+            'aliases' => array(),
+            'reference' => '8.x-1.4',
+            'dev_requirement' => false,
+        ),
         'drupal/quickedit' => array(
             'dev_requirement' => false,
             'replaced' => array(
@@ -2086,7 +2095,7 @@
             'type' => 'project',
             'install_path' => __DIR__ . '/../../',
             'aliases' => array(),
-            'reference' => '12c2eafc0e95f979c96849005ecf8e09d6dcb2ae',
+            'reference' => 'd2ba02375d2963b4d365129930f11ab04573ee3e',
             'dev_requirement' => false,
         ),
         'pantheon-systems/quicksilver-pushback' => array(

web/modules/queue_mail/LICENSE.txt

+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+  Ty Coon, President of Vice
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+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

web/modules/queue_mail/README.md

+Queue mail
+==========
+
+Enable queue for mails
+----------------------
+Queue mail module does not put your mails to queue after enabling. 
+By default this feature is disabled.
+
+You should go to the settings page /admin/config/system/queue_mail 
+and add mail IDs to the "Mail IDs to queue" field.
+
+Use "*" to enable queue for sending all emails.
+
+When Queue mail processes mails it marks all mails as queued or not.
+So you can check status of mail in your code:
+
+```
+$message = \Drupal::service('plugin.manager.mail')->mail();
+if ($message['queued']] {
+  // Message has been added to the queue.
+}
+else {
+  // Message has not been added to the queue. 
+}
+``` 
+
+Language
+--------
+If you need full language support in mail formatting please enable 
+Queue Mail Language (queue_mail_language) module. It will use language
+of mail instead of default system language in mail formatting.
+
+Drush
+-----
+Drush has his own command to process specific queue: 
+
+`drush queue-run QUEUE_NAME`
+
+So you can use command to run queue_mail worker:
+
+`drush queue-run queue_mail --time-limit=15` 
+
+__Note__: you have to use time-limit option with "drush queue-run queue_mail"
+because "Queue processing time" setting doesn't work in this case. If system
+can't send mails it adds them back to queue. Without time-limit option this 
+process won't be finished.
+
+API
+---
+Queue mail implements hook_queue_mail_send_alter(). This hook is very similar
+hook_mail_alter() and allows change mail message right before sending.
+
+See queue_mail.api.php for more information.
+

web/modules/queue_mail/composer.json

+{
+    "name": "drupal/queue_mail",
+    "description": "Queues all mail sent by your Drupal site so that it is sent via cron using the Drupal Queue API.",
+    "type": "drupal-module",
+    "homepage": "http://drupal.org/project/queue_mail",
+    "authors": [
+        {
+            "name": "Evgenii Nikitin (sinn)",
+            "homepage": "https://www.drupal.org/u/sinn",
+            "role": "Maintainer"
+        },
+        {
+            "name": "Steven Jones",
+            "homepage": "https://www.drupal.org/user/99644",
+            "role": "Maintainer"
+        }
+    ],
+    "support": {
+        "issues": "https://www.drupal.org/project/issues/queue_mail",
+        "source": "https://git.drupalcode.org/project/queue_mail"
+    },
+    "require": {
+        "drupal/core": "^8.8.0 || ^9.0"
+    }
+}

web/modules/queue_mail/config/install/queue_mail.settings.yml

+queue_mail_keys: ''
+queue_mail_queue_time: 15
+queue_mail_queue_wait_time: 0
+threshold: 50
+requeue_interval: 10800

web/modules/queue_mail/config/schema/queue_mail.schema.yml

+queue_mail.settings:
+  type: config_object
+  label: 'Queue mail settings'
+  mapping:
+    queue_mail_keys:
+      type: string
+      label: 'Mail IDs to queue'
+    queue_mail_queue_time:
+      type: integer
+      label: 'Queue processing time (max)'
+    queue_mail_queue_wait_time:
+      type: integer
+      label: 'Wait time per item'
+    threshold:
+      type: integer
+      label: 'Queue retry threshold'
+    requeue_interval:
+      type: integer
+      label: 'Requeue interval'

web/modules/queue_mail/modules/queue_mail_language/queue_mail_language.info.yml

+name: Queue Mail Language
+type: module
+core_version_requirement: ^8 || ^9
+description: Adds language support for queued mails.
+package: Mail
+dependencies:
+  - drupal:language
+
+# Information added by Drupal.org packaging script on 2021-09-22
+version: '8.x-1.4'
+project: 'queue_mail'
+datestamp: 1632316351

web/modules/queue_mail/modules/queue_mail_language/queue_mail_language.module

+<?php
+
+/**
+ * @file
+ * The Queue Mail Language module.
+ */
+
+use Drupal\queue_mail_language\Plugin\QueueWorker\LanguageAwareSendMailQueueWorker;
+
+/**
+ * Implements hook_queue_info_alter().
+ */
+function queue_mail_language_queue_info_alter(&$queues) {
+  $queues['queue_mail']['class'] = LanguageAwareSendMailQueueWorker::class;
+}

web/modules/queue_mail/modules/queue_mail_language/queue_mail_language.services.yml

+services:
+  queue_mail.language_negotiator:
+    class: Drupal\queue_mail_language\QueueMailLanguageNegotiator
+    arguments: ['@language_manager', '@plugin.manager.language_negotiation_method', '@config.factory', '@settings', '@request_stack']
+    calls:
+      - [initLanguageManager]

web/modules/queue_mail/modules/queue_mail_language/src/Plugin/QueueWorker/LanguageAwareSendMailQueueWorker.php

+<?php
+
+namespace Drupal\queue_mail_language\Plugin\QueueWorker;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Logger\LoggerChannelFactoryInterface;
+use Drupal\Core\Mail\MailManagerInterface;
+use Drupal\Core\Theme\ThemeInitializationInterface;
+use Drupal\Core\Theme\ThemeManagerInterface;
+use Drupal\language\ConfigurableLanguageManagerInterface;
+use Drupal\queue_mail\Plugin\QueueWorker\SendMailQueueWorker;
+use Drupal\queue_mail_language\QueueMailLanguageNegotiator;
+use Symfony\Component\DependencyInjection\ContainerAwareInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Sends emails from queue with language support.
+ */
+class LanguageAwareSendMailQueueWorker extends SendMailQueueWorker {
+
+  /**
+   * The configurable language manager.
+   *
+   * @var \Drupal\language\ConfigurableLanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
+   * The queue mail language negotiator.
+   *
+   * @var \Drupal\queue_mail_language\QueueMailLanguageNegotiator
+   */
+  protected $queueMailLanguageNegotiator;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $container->get('theme.manager'),
+      $container->get('theme.initialization'),
+      $container->get('plugin.manager.mail'),
+      $container->get('logger.factory'),
+      $container->get('config.factory'),
+      $container->get('queue'),
+      $container->get('module_handler'),
+      $container->get('language_manager'),
+      $container->get('queue_mail.language_negotiator')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(
+    ThemeManagerInterface $theme_manager,
+    ThemeInitializationInterface $theme_init,
+    MailManagerInterface $mail_manager,
+    LoggerChannelFactoryInterface $logger_factory,
+    ConfigFactoryInterface $config_factory,
+    ContainerAwareInterface $queue_factory,
+    ModuleHandlerInterface $module_handler,
+    ConfigurableLanguageManagerInterface $language_manager,
+    QueueMailLanguageNegotiator $queue_mail_language_negotiator
+  ) {
+    parent::__construct($theme_manager, $theme_init, $mail_manager, $logger_factory, $config_factory, $queue_factory, $module_handler);
+    $this->languageManager = $language_manager;
+    $this->queueMailLanguageNegotiator = $queue_mail_language_negotiator;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setMailLanguage(array $message) {
+    $default_langcode = $this->languageManager->getDefaultLanguage()->getId();
+    if ($message['langcode'] !== $default_langcode) {
+      $this->setNegotiatorLanguage($message['langcode']);
+    }
+    return $default_langcode;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setActiveLanguage(array $message, $langcode) {
+    if ($message['langcode'] !== $langcode) {
+      $this->setNegotiatorLanguage($langcode);
+    }
+  }
+
+  /**
+   * Sets the queue mail negotiator language.
+   *
+   * @param string $langcode
+   *   The new language code.
+   */
+  protected function setNegotiatorLanguage($langcode) {
+    if ($this->languageManager->getNegotiator() !== $this->queueMailLanguageNegotiator) {
+      $this->languageManager->setNegotiator($this->queueMailLanguageNegotiator);
+    }
+    $this->queueMailLanguageNegotiator->setLanguageCode($langcode);
+    // Needed to re-run language negotiation.
+    $this->languageManager->reset();
+  }
+
+}

web/modules/queue_mail/modules/queue_mail_language/src/QueueMailLanguageNegotiator.php

+<?php
+
+namespace Drupal\queue_mail_language;
+
+use Drupal\language\LanguageNegotiator;
+
+/**
+ * Class responsible for performing language negotiation.
+ */
+class QueueMailLanguageNegotiator extends LanguageNegotiator {
+
+  /**
+   * Language code.
+   *
+   * @var string
+   */
+  public $languageCode = NULL;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function initializeType($type) {
+    $language = NULL;
+    $method_id = static::METHOD_ID;
+    $availableLanguages = $this->languageManager->getLanguages();
+
+    if ($this->languageCode && isset($availableLanguages[$this->languageCode])) {
+      $language = $availableLanguages[$this->languageCode];
+    }
+    else {
+      // If no other language was found use the default one.
+      $language = $this->languageManager->getDefaultLanguage();
+    }
+
+    return [$method_id => $language];
+  }
+
+  /**
+   * Sets language code.
+   *
+   * @param string $langcode
+   *   Language code.
+   */
+  public function setLanguageCode($langcode) {
+    $this->languageCode = $langcode;
+  }
+
+}

web/modules/queue_mail/modules/queue_mail_language/tests/src/Functional/QueueMailLanguageFunctionalTest.php

+<?php
+
+namespace Drupal\Tests\queue_mail_language\Functional;
+
+use Drupal\language\Entity\ConfigurableLanguage;
+use Drupal\Tests\queue_mail\Functional\QueueMailFunctionalTest;
+
+/**
+ * Tests queue mail functionality with language support.
+ *
+ * @group queue_mail
+ */
+class QueueMailLanguageFunctionalTest extends QueueMailFunctionalTest {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = ['queue_mail_language', 'queue_mail_test'];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp():void {
+    parent::setUp();
+
+    $this->langcode = 'it';
+    ConfigurableLanguage::createFromLangcode($this->langcode)->save();
+  }
+
+}

web/modules/queue_mail/queue_mail.api.php

+<?php
+
+/**
+ * @file
+ * Documentation for Queue Mail API.
+ */
+
+/**
+ * @addtogroup hooks
+ * @{
+ */
+
+/**
+ * Alter a queued email when it is dequeued and about to be sent.
+ *
+ * This hook is largely equivalent to hook_mail_alter(), which will have already
+ * been called for this email, but as sending can be delayed for some time, if
+ * you need to do specific things just before the email is actually sent, you
+ * can use this hook.
+ *
+ * @param array $message
+ *   An array containing the message data. Keys in this array include:
+ *   - 'id':
+ *     The MailManagerInterface->mail() id of the message. Look at module source
+ *     code or MailManagerInterface->mail() for possible id values.
+ *   - 'to':
+ *     The address or addresses the message will be sent to. The
+ *     formatting of this string must comply with RFC 2822.
+ *   - 'from':
+ *     The address the message will be marked as being from, which is
+ *     either a custom address or the site-wide default email address.
+ *   - 'subject':
+ *     Subject of the email to be sent. This must not contain any newline
+ *     characters, or the email may not be sent properly.
+ *   - 'body':
+ *     An array of strings or objects that implement
+ *     \Drupal\Component\Render\MarkupInterface containing the message text. The
+ *     message body is created by concatenating the individual array strings
+ *     into a single text string using "\n\n" as a separator.
+ *   - 'headers':
+ *     Associative array containing mail headers, such as From, Sender,
+ *     MIME-Version, Content-Type, etc.
+ *   - 'params':
+ *     An array of optional parameters supplied by the caller of
+ *     MailManagerInterface->mail() that is used to build the message before
+ *     hook_mail_alter() is invoked.
+ *   - 'language':
+ *     The language object used to build the message before hook_mail_alter()
+ *     is invoked.
+ *   - 'send':
+ *     Set to FALSE to abort sending this email message.
+ *
+ * @see \Drupal\Core\Mail\MailManagerInterface::mail()
+ */
+function hook_queue_mail_send_alter(array &$message) {
+  if ($message['id'] == 'modulename_messagekey') {
+    if (!example_notifications_optin($message['to'], $message['id'])) {
+      // If the recipient has opted to not receive such messages, cancel
+      // sending.
+      $message['send'] = FALSE;
+      return;
+    }
+    $message['body'][] = "--\nMail sent out from " . \Drupal::config('system.site')->get('name');
+  }
+}
+
+/**
+ * @} End of "addtogroup hooks".
+ */

web/modules/queue_mail/queue_mail.info.yml

+name: Queue Mail
+type: module
+core_version_requirement: ^8 || ^9
+description: Queues all mail sent by your Drupal site so that it is sent via cron using the Drupal Queue API. This is helpful for large traffic sites where sending a lot of emails per page request can slow things down considerably.
+package: Mail
+configure: queue_mail.admin_settings
+
+# Information added by Drupal.org packaging script on 2021-09-22
+version: '8.x-1.4'
+project: 'queue_mail'
+datestamp: 1632316351

web/modules/queue_mail/queue_mail.install

+<?php
+
+/**
+ * @file
+ * Install, update and uninstall functions for the Queue Mail module.
+ */
+
+use Drupal\Core\Url;
+
+/**
+ * Implements hook_install().
+ */
+function queue_mail_install() {
+  _queue_mail_get_queue()->createQueue();
+}
+
+/**
+ * Implements hook_uninstall().
+ */
+function queue_mail_uninstall() {
+  _queue_mail_get_queue()->deleteQueue();
+}
+
+/**
+ * Implements hook_requirements().
+ */
+function queue_mail_requirements($phase) {
+  $requirements = [];
+
+  switch ($phase) {
+    case 'runtime':
+      $queue_length = _queue_mail_get_queue()->numberOfItems();
+      $requirements['queue_mail'] = [
+        'title' => t('Queue mail'),
+        'value' => \Drupal::translation()->formatPlural(
+          $queue_length,
+          '1 mail currently queued for sending.',
+          '@count mails currently queued for sending.'),
+        'description' => [
+          [
+            '#markup' => t('Sending of queued mails happens on cron.'),
+            '#suffix' => ' ',
+          ],
+          [
+            '#markup' => t('You can <a href=":cron">run cron manually</a>.',
+              [':cron' => Url::fromRoute('system.run_cron')->toString()]),
+            '#prefix' => '<br/>',
+          ],
+        ],
+        'severity' => $queue_length > 0 ? REQUIREMENT_INFO : REQUIREMENT_OK,
+      ];
+      break;
+  }
+
+  return $requirements;
+}
+
+/**
+ * Set configuration settings for a retry limit.
+ */
+function queue_mail_update_8001() {
+  \Drupal::configFactory()
+    ->getEditable('queue_mail.settings')
+    ->set('threshold', 50)
+    ->set('requeue_interval', 10800)
+    ->save();
+}
+
+/**
+ * Set configuration settings for a wait time per item.
+ */
+function queue_mail_update_8002() {
+  \Drupal::configFactory()
+    ->getEditable('queue_mail.settings')
+    ->set('queue_mail_queue_wait_time', 0)
+    ->save();
+}
+
+/**
+ * Enable "queue_mail_language" to preserve backwards-compatibility.
+ */
+function queue_mail_update_8003() {
+  /** @var \Drupal\Core\Extension\ModuleInstallerInterface $module_installer */
+  $module_installer = \Drupal::service('module_installer');
+  $module_installer->install(['queue_mail_language']);
+}