diff --git a/Helper/Data.php b/Helper/Data.php
index f0a4080..147f861 100644
--- a/Helper/Data.php
+++ b/Helper/Data.php
@@ -293,7 +293,7 @@ public function __construct(
      * Get config value
      *
      * @param string $path
-     * @param string $storeId
+     * @param string|null $storeId
      * @param null|int|string $scope
      * @return mixed
      */
diff --git a/Model/System/Config/Backend/MailjetList.php b/Model/System/Config/Backend/MailjetList.php
new file mode 100644
index 0000000..e0ce90e
--- /dev/null
+++ b/Model/System/Config/Backend/MailjetList.php
@@ -0,0 +1,208 @@
+<?php
+
+namespace Mailjet\Mailjet\Model\System\Config\Backend;
+
+use Magento\Framework\App\Cache\TypeListInterface;
+use Magento\Framework\App\Config\ScopeConfigInterface;
+use Magento\Framework\App\Config\Value;
+use Magento\Framework\Data\Collection\AbstractDb;
+use Magento\Framework\Model\Context;
+use Magento\Framework\Model\ResourceModel\AbstractResource;
+use Magento\Framework\Registry;
+use Magento\Newsletter\Model\ResourceModel\Subscriber\CollectionFactory;
+use Magento\Newsletter\Model\Subscriber;
+use Magento\Store\Model\StoreManagerInterface;
+use Mailjet\Mailjet\Api\ConfigRepositoryInterface;
+use Mailjet\Mailjet\Api\Data\ConfigInterfaceFactory;
+use Mailjet\Mailjet\Api\SubscriberQueueRepositoryInterface;
+use Mailjet\Mailjet\Helper\Data;
+use Magento\Store\Model\ScopeInterface;
+use Mailjet\Mailjet\Model\Api\Connection;
+use Mailjet\Mailjet\Model\JobRepository;
+
+class MailjetList extends Value
+{
+    /**
+     * @var \Mailjet\Mailjet\Api\Data\ConfigInterfaceFactory
+     */
+    protected $configFactory;
+
+    /**
+     * @var \Mailjet\Mailjet\Model\Api\Connection
+     */
+    protected $apiConnection;
+    /**
+     * @var \Mailjet\Mailjet\Api\ConfigRepositoryInterface
+     */
+    protected $configRepository;
+    /**
+     * @var \Mailjet\Mailjet\Model\JobRepository
+     */
+    private $jobRepository;
+    /**
+     * @var \Magento\Store\Model\StoreManagerInterface
+     */
+    private $storeManager;
+    /**
+     * @var \Mailjet\Mailjet\Api\SubscriberQueueRepositoryInterface
+     */
+    private $subscriberQueueRepository;
+    /**
+     * @var \Magento\Newsletter\Model\ResourceModel\Subscriber\CollectionFactory
+     */
+    private $subscriberCollectionFactory;
+    /**
+     * @var \Mailjet\Mailjet\Helper\Data
+     */
+    protected $dataHelper;
+
+    /**
+     * @param \Magento\Framework\Model\Context $context
+     * @param \Magento\Framework\Registry $registry
+     * @param \Magento\Framework\App\Config\ScopeConfigInterface $config
+     * @param \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList
+     * @param \Mailjet\Mailjet\Api\ConfigRepositoryInterface $configRepository
+     * @param \Mailjet\Mailjet\Model\Api\Connection $apiConnection
+     * @param \Mailjet\Mailjet\Api\Data\ConfigInterfaceFactory $configFactory
+     * @param \Mailjet\Mailjet\Model\JobRepository $jobRepository
+     * @param \Magento\Store\Model\StoreManagerInterface $storeManager
+     * @param \Mailjet\Mailjet\Api\SubscriberQueueRepositoryInterface $subscriberQueueRepository
+     * @param \Magento\Newsletter\Model\ResourceModel\Subscriber\CollectionFactory $subscriberCollectionFactory
+     * @param \Mailjet\Mailjet\Helper\Data $dataHelper
+     * @param \Magento\Framework\Model\ResourceModel\AbstractResource|null $resource
+     * @param \Magento\Framework\Data\Collection\AbstractDb|null $resourceCollection
+     * @param array $data
+     */
+    public function __construct(
+        Context                            $context,
+        Registry                           $registry,
+        ScopeConfigInterface               $config,
+        TypeListInterface                  $cacheTypeList,
+        ConfigRepositoryInterface          $configRepository,
+        Connection                         $apiConnection,
+        ConfigInterfaceFactory             $configFactory,
+        JobRepository                      $jobRepository,
+        StoreManagerInterface              $storeManager,
+        SubscriberQueueRepositoryInterface $subscriberQueueRepository,
+        CollectionFactory                  $subscriberCollectionFactory,
+        Data                               $dataHelper,
+        AbstractResource                   $resource = null,
+        AbstractDb                         $resourceCollection = null,
+        array                              $data = []
+    ) {
+        $this->configRepository = $configRepository;
+        $this->apiConnection = $apiConnection;
+        $this->configFactory = $configFactory;
+        $this->jobRepository = $jobRepository;
+        $this->storeManager = $storeManager;
+        $this->subscriberQueueRepository = $subscriberQueueRepository;
+        $this->subscriberCollectionFactory = $subscriberCollectionFactory;
+        $this->dataHelper = $dataHelper;
+        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
+    }
+
+    /**
+     * After Save
+     *
+     * @return \Mailjet\Mailjet\Model\System\Config\Backend\MailjetList
+     * @throws \Magento\Framework\Exception\LocalizedException
+     */
+    public function afterSave()
+    {
+        $syncPreference = $this->getFieldsetDataValue('sync_preference');
+        $websiteId = $this->getScopeId();
+
+        if ($this->getValue() && $this->isValueChanged() && $this->checkResyncAll($websiteId, $syncPreference)) {
+
+            $configParams = $this->getConfigParams($websiteId);
+            $config = $this->configFactory->create();
+            $config->setApiKey($configParams['apiKey'])
+                ->setSecretKey($configParams['secretKey'])
+                ->setList($configParams['list'])
+                ->setSyncPreference($syncPreference)
+                ->setStoreId(0)
+                ->setEcommerceData($configParams['ecommerceData'])
+                ->setDeleted(1);
+
+            $this->configRepository->save($config);
+
+            if ($config->getId()) {
+                $collection = $this->subscriberCollectionFactory->create();
+                if ($websiteId) {
+                    $website = $this->storeManager->getWebsite($websiteId);
+                    $collection->addStoreFilter($website->getStoreIds());
+                }
+                foreach ($collection as $subscriber) {
+                    if ($subscriber->getSubscriberStatus() == Subscriber::STATUS_SUBSCRIBED) {
+                        $this->subscriberQueueRepository->subscribe($subscriber, $config);
+                    } else {
+                        $this->subscriberQueueRepository->unsubscribe($subscriber, $config);
+                    }
+                }
+
+                $this->jobRepository->generateJobs([$config]);
+            }
+
+        }
+        return parent::afterSave();
+    }
+
+    /**
+     * Check Resync All
+     *
+     * @param string|null $websiteId
+     * @param int|null $syncPreference
+     * @return bool|mixed
+     */
+    private function checkResyncAll($websiteId, $syncPreference)
+    {
+        if ($websiteId) {
+            $isRsyncAll = $this->dataHelper->getConfigValue(
+                Data::CONFIG_PATH_ECOMMERCE_DATA,
+                $websiteId,
+                ScopeInterface::SCOPE_WEBSITES
+            );
+        } else {
+            $isRsyncAll = $syncPreference == Data::SYNC_PREFERENCE_ALL ||
+            $this->dataHelper->getConfigValue(
+                data::CONFIG_PATH_ACCOUNT_SYNC_PREFERENCE
+            ) == Data::SYNC_PREFERENCE_ALL;
+        }
+        return $isRsyncAll;
+    }
+
+    /**
+     * Get Params from configuration
+     *
+     * @param string|null $websiteId
+     * @return array
+     */
+    private function getConfigParams($websiteId)
+    {
+        $configParams = [];
+        $configParams['list'] = $this->getFieldsetDataValue('mailjet_list');
+        if ($websiteId) {
+            $configParams['secretKey'] = $this->dataHelper->getConfigValue(
+                Data::CONFIG_PATH_ACCOUNT_SECRET_KEY,
+                $websiteId,
+                ScopeInterface::SCOPE_WEBSITES
+            );
+            $configParams['ecommerceData'] = $this->dataHelper->getConfigValue(
+                Data::CONFIG_PATH_ECOMMERCE_DATA,
+                $websiteId,
+                ScopeInterface::SCOPE_WEBSITES
+            );
+            $configParams['apiKey'] = $this->dataHelper->getConfigValue(
+                Data::CONFIG_PATH_ACCOUNT_API_KEY,
+                $websiteId,
+                ScopeInterface::SCOPE_WEBSITES
+            );
+
+        } else {
+            $configParams['secretKey'] = $this->dataHelper->getConfigValue(Data::CONFIG_PATH_ACCOUNT_SECRET_KEY);
+            $configParams['ecommerceData'] = $this->dataHelper->getConfigValue(Data::CONFIG_PATH_ECOMMERCE_DATA);
+            $configParams['apiKey'] = $this->dataHelper->getConfigValue(Data::CONFIG_PATH_ACCOUNT_API_KEY);
+        }
+        return $configParams;
+    }
+}
diff --git a/etc/adminhtml/system.xml b/etc/adminhtml/system.xml
index 37df0bc..b75d456 100644
--- a/etc/adminhtml/system.xml
+++ b/etc/adminhtml/system.xml
@@ -50,6 +50,7 @@
                 <field id="mailjet_list" type="select" translate="label" sortOrder="30" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Mailjet List</label>
                     <source_model>Mailjet\Mailjet\Model\System\Config\Source\MailjetList</source_model>
+                    <backend_model>Mailjet\Mailjet\Model\System\Config\Backend\MailjetList</backend_model>
                     <validate>mailjet-mailjet-list</validate>
                     <depends>
                         <field id="active">1</field>