diff --git a/appinfo/info.xml b/appinfo/info.xml
index 6bb3d39258..7c8cf5da31 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -34,7 +34,7 @@ The rating depends on the installed text processing backend. See [the rating ove
 
 Learn more about the Nextcloud Ethical AI Rating [in our blog](https://nextcloud.com/blog/nextcloud-ethical-ai-rating/).
 	]]></description>
-	<version>4.2.0-alpha.0</version>
+	<version>4.2.1-alpha.0</version>
 	<licence>agpl</licence>
 	<author homepage="https://github.com/ChristophWurst">Christoph Wurst</author>
 	<author homepage="https://github.com/GretaD">GretaD</author>
diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index 01bea26944..4d1cf88ceb 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -47,10 +47,12 @@
 use OCA\Mail\Listener\MoveJunkListener;
 use OCA\Mail\Listener\NewMessageClassificationListener;
 use OCA\Mail\Listener\NewMessagesNotifier;
+use OCA\Mail\Listener\NewMessagesSummarizeListener;
 use OCA\Mail\Listener\OauthTokenRefreshListener;
 use OCA\Mail\Listener\OptionalIndicesListener;
 use OCA\Mail\Listener\OutOfOfficeListener;
 use OCA\Mail\Listener\SpamReportListener;
+use OCA\Mail\Listener\TaskProcessingListener;
 use OCA\Mail\Listener\UserDeletedListener;
 use OCA\Mail\Notification\Notifier;
 use OCA\Mail\Provider\MailProvider;
@@ -72,6 +74,7 @@
 use OCP\AppFramework\Bootstrap\IRegistrationContext;
 use OCP\DB\Events\AddMissingIndicesEvent;
 use OCP\IServerContainer;
+use OCP\TaskProcessing\Events\TaskSuccessfulEvent;
 use OCP\User\Events\OutOfOfficeChangedEvent;
 use OCP\User\Events\OutOfOfficeClearedEvent;
 use OCP\User\Events\OutOfOfficeEndedEvent;
@@ -133,6 +136,7 @@ public function register(IRegistrationContext $context): void {
 		$context->registerEventListener(NewMessagesSynchronized::class, NewMessageClassificationListener::class);
 		$context->registerEventListener(NewMessagesSynchronized::class, MessageKnownSinceListener::class);
 		$context->registerEventListener(NewMessagesSynchronized::class, NewMessagesNotifier::class);
+		$context->registerEventListener(NewMessagesSynchronized::class, NewMessagesSummarizeListener::class);
 		$context->registerEventListener(SynchronizationEvent::class, AccountSynchronizedThreadUpdaterListener::class);
 		$context->registerEventListener(UserDeletedEvent::class, UserDeletedListener::class);
 		$context->registerEventListener(NewMessagesSynchronized::class, FollowUpClassifierListener::class);
@@ -141,6 +145,7 @@ public function register(IRegistrationContext $context): void {
 		$context->registerEventListener(OutOfOfficeChangedEvent::class, OutOfOfficeListener::class);
 		$context->registerEventListener(OutOfOfficeClearedEvent::class, OutOfOfficeListener::class);
 		$context->registerEventListener(OutOfOfficeScheduledEvent::class, OutOfOfficeListener::class);
+		$context->registerEventListener(TaskSuccessfulEvent::class, TaskProcessingListener::class);
 
 		$context->registerMiddleWare(ErrorMiddleware::class);
 		$context->registerMiddleWare(ProvisioningMiddleware::class);
diff --git a/lib/Db/Message.php b/lib/Db/Message.php
index 229c26f395..3376f3742f 100644
--- a/lib/Db/Message.php
+++ b/lib/Db/Message.php
@@ -58,6 +58,8 @@
  * @method bool|null getFlagMdnsent()
  * @method void setPreviewText(?string $subject)
  * @method null|string getPreviewText()
+ * @method void setSummary(?string $summary)
+ * @method null|string getSummary()
  * @method void setUpdatedAt(int $time)
  * @method int getUpdatedAt()
  * @method bool isImipMessage()
@@ -108,6 +110,7 @@ class Message extends Entity implements JsonSerializable {
 	protected $flagImportant = false;
 	protected $flagMdnsent;
 	protected $previewText;
+	protected $summary;
 	protected $imipMessage = false;
 	protected $imipProcessed = false;
 	protected $imipError = false;
@@ -325,6 +328,7 @@ static function (Tag $tag) {
 			'threadRootId' => $this->getThreadRootId(),
 			'imipMessage' => $this->isImipMessage(),
 			'previewText' => $this->getPreviewText(),
+			'summary' => $this->getSummary(),
 			'encrypted' => ($this->isEncrypted() === true),
 			'mentionsMe' => $this->getMentionsMe(),
 		];
diff --git a/lib/Listener/NewMessagesSummarizeListener.php b/lib/Listener/NewMessagesSummarizeListener.php
new file mode 100644
index 0000000000..e6f37e3bc8
--- /dev/null
+++ b/lib/Listener/NewMessagesSummarizeListener.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Mail\Listener;
+
+use OCA\Mail\Contracts\IMailManager;
+use OCA\Mail\Events\NewMessagesSynchronized;
+use OCA\Mail\Exception\ServiceException;
+use OCA\Mail\IMAP\IMAPClientFactory;
+use OCA\Mail\Service\AiIntegrations\AiIntegrationsService;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use Psr\Log\LoggerInterface;
+
+/**
+ * @template-implements IEventListener<Event|NewMessagesSummarizeListener>
+ */
+class NewMessagesSummarizeListener implements IEventListener {
+
+	public function __construct(
+		protected LoggerInterface $logger,
+		protected IMAPClientFactory $imapFactory,
+		protected AiIntegrationsService $aiService,
+		protected IMailManager $mailManager
+	) { }
+
+	public function handle(Event $event): void {
+
+		if (!($event instanceof NewMessagesSynchronized)) {
+			return;
+		}
+
+		try {
+			$this->aiService->summarizeMessages(
+				$event->getAccount(),
+				$event->getMessages(),
+			);
+		} catch (ServiceException $e) {
+			$this->logger->error('Could not classify incoming message importance: ' . $e->getMessage(), [
+				'exception' => $e,
+			]);
+		}
+	}
+}
diff --git a/lib/Listener/TaskProcessingListener.php b/lib/Listener/TaskProcessingListener.php
new file mode 100644
index 0000000000..8aabe0acd3
--- /dev/null
+++ b/lib/Listener/TaskProcessingListener.php
@@ -0,0 +1,67 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Mail\Listener;
+
+use OCA\Mail\AppInfo\Application;
+use OCA\Mail\Db\MessageMapper;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\TaskProcessing\Events\TaskSuccessfulEvent;
+use OCP\TaskProcessing\TaskTypes\TextToTextSummary;
+use Psr\Log\LoggerInterface;
+
+/**
+ * @template-implements IEventListener<Event|NewMessagesSummarizeListener>
+ */
+class TaskProcessingListener implements IEventListener {
+
+	public function __construct(
+		protected LoggerInterface $logger,
+		protected MessageMapper $messageStore,
+	) { }
+
+	public function handle(Event $event): void {
+
+		if (!($event instanceof TaskSuccessfulEvent)) {
+			return;
+		}
+
+		$task = $event->getTask();
+
+		if ($task->getAppId() !== Application::APP_ID) {
+			return;
+		}
+
+		if ($task->getTaskTypeId() !== TextToTextSummary::ID) {
+			return;
+		}
+
+		list($type, $id) = explode(':', $task->getCustomId());
+		$userId = $task->getUserId();
+		$summary = $task->getOutput()['output'];
+
+		match ($type) {
+			'message' => $this->handleMessageSummary($userId, (int)$id, $summary),
+		};
+
+	}
+
+	protected function handleMessageSummary(string $userId, int $id, string $summary) {
+		$messages = $this->messageStore->findByIds($userId, [$id], '');
+
+		if (count($messages) !== 1) {
+			return;
+		}
+
+		$message = $messages[0];
+		$message->setSummary($summary);
+		$this->messageStore->update($message);
+	}
+}
diff --git a/lib/Migration/Version4100Date20241209000000.php b/lib/Migration/Version4100Date20241209000000.php
new file mode 100644
index 0000000000..6161edaafc
--- /dev/null
+++ b/lib/Migration/Version4100Date20241209000000.php
@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Mail\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\DB\Types;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version4100Date20241209000000 extends SimpleMigrationStep {
+
+	/**
+	 * @param IOutput $output
+	 * @param Closure(): ISchemaWrapper $schemaClosure
+	 * @param array $options
+	 * @return null|ISchemaWrapper
+	 */
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		$schema = $schemaClosure();
+
+		$outboxTable = $schema->getTable('mail_messages');
+		if (!$outboxTable->hasColumn('summary')) {
+			$outboxTable->addColumn('summary', Types::STRING, [
+				'length' => 1024,
+				'notnull' => false,
+			]);
+		}
+		return $schema;
+	}
+}
diff --git a/lib/Service/AiIntegrations/AiIntegrationsService.php b/lib/Service/AiIntegrations/AiIntegrationsService.php
index afd41fa19d..cdaa363862 100644
--- a/lib/Service/AiIntegrations/AiIntegrationsService.php
+++ b/lib/Service/AiIntegrations/AiIntegrationsService.php
@@ -9,6 +9,7 @@
 
 namespace OCA\Mail\Service\AiIntegrations;
 
+use Horde_Imap_Client_Socket;
 use JsonException;
 use OCA\Mail\Account;
 use OCA\Mail\AppInfo\Application;
@@ -20,6 +21,10 @@
 use OCA\Mail\Model\EventData;
 use OCA\Mail\Model\IMAPMessage;
 use OCP\IConfig;
+use OCP\TaskProcessing\IManager as TaskProcessingManager;
+use OCP\TaskProcessing\Task as TaskProcessingTask;
+use OCP\TaskProcessing\TaskTypes\TextToTextSummary;
+use OCP\TaskProcessing\Exception\Exception as TaskProcessingException;
 use OCP\TextProcessing\FreePromptTaskType;
 use OCP\TextProcessing\IManager;
 use OCP\TextProcessing\SummaryTaskType;
@@ -61,6 +66,74 @@ public function __construct(ContainerInterface $container, Cache $cache, IMAPCli
 		$this->mailManager = $mailManager;
 		$this->config = $config;
 	}
+
+	/**
+	 * generates summary for each message
+	 * 
+	 * @param Account $account
+	 * @param array<Message> $messages
+	 * @param Horde_Imap_Client_Socket $client
+	 *
+	 * @return null|string
+	 *
+	 * @throws ServiceException
+	 */
+	public function summarizeMessages(Account $account, array $messages, Horde_Imap_Client_Socket $client = null): void {
+		try {
+			$manager = $this->container->get(TaskProcessingManager::class);
+		} catch (\Throwable $e) {
+			throw new ServiceException('Task processing is not available', 0, $e);
+		}
+		try {
+			$manager->getPreferredProvider(TextToTextSummary::ID);
+		} catch (TaskProcessingException $e) {
+			throw new ServiceException('No text summary provider available');
+		}
+		if (!$client) {
+			$client = $this->clientFactory->getClient($account);
+		}
+		try {
+			foreach ($messages as $entry) {
+
+				if (!empty($entry->getSummary())) {
+					continue;
+				}
+				// retrieve full message from server
+				$userId = $account->getUserId();
+				$mailboxId = $entry->getMailboxId();
+				$messageLocalId = $entry->getId();
+				$messageRemoteId = $entry->getUid();
+				$mailbox = $this->mailManager->getMailbox($userId, $mailboxId);
+				$message = $this->mailManager->getImapMessage(
+					$client,
+					$account,
+					$mailbox,
+					$messageRemoteId,
+					true
+				);
+				$messageBody = $message->getPlainBody();
+				// construct prompt and task
+				$prompt = "You are tasked with formulating a helpful summary of a email message. \r\n" .
+						  "The summary should be less than 1024 characters. \r\n" .
+						  "Here is the ***E-MAIL*** for which you must generate a helpful summary: \r\n" .
+						  "***START_OF_E-MAIL***\r\n$messageBody\r\n***END_OF_E-MAIL***\r\n";
+				$task = new TaskProcessingTask(
+					TextToTextSummary::ID,
+					[
+						'max_tokens' => 1024,
+						'input' => $prompt,
+					],
+					Application::APP_ID,
+					$userId,
+					'message:' . (string)$messageLocalId
+				);
+				$manager->scheduleTask($task);
+			}
+		} finally {
+			$client->logout();
+		}
+	}
+
 	/**
 	 * @param Account $account
 	 * @param string $threadId