We have vastly reduced the load on your server when you send emails via MailChimp. To achieve this, we had to reset one of the settings of the <b>E-mail marketing</b> add-on on our end. Once you select the desired value again, the MailChimp integration will work again, and better than before. Here's what you need to do:<br><br><ol><li>Open your storefront. It gets closed automatically during the upgrade, but the following steps require the storefront to be open.</li><br><li>Go to the MaliChimp settings of the <b>E-mail marketing</b> add-on.</li><br><li>Select the <b>List</b> again.</li><br><li>Save your changes.</li></ol><br><a href="[url]" target="_blank">Select the list</a>