Are you trying to send emails through QuickBooks and stuck with the error QuickBooks outlook is not responding? Quickbooks 2021 Outlook is not responding is an irritating error of the QuickBooks Desktop application that can prevent you from sending an email using Outlook within the QuickBooks. Quickbooks Outlook Not Responding. by the faulty settings of your Email or Internet Explorer preferences. Outlook is an email manager application of Microsoft that can be integrated with third-party applications to send and receive emails. However, when sending an email from QuickBooks, you may encounter QuickBooks Outlook is not responding error. In this post, we will discuss the steps to resolve the QuickBooks Outlook email error and troubleshoot it using relevant solutions.