QuickBooks Outlook is not responding when sending emails is a common error faced by many users. It often happens due to incorrect Outlook configuration, damaged Outlook profile, or compatibility issues with QuickBooks Desktop. This not only prevents sending transactions or invoices but also causes workflow delays. You can resolve it by repairing the Outlook program, updating QuickBooks Desktop, and ensuring that Outlook is set as the default email application in Windows. For persistent problems, professional troubleshooting is recommended. Call +1-866-408-0444 for quick solutions and to restore seamless email functionality with QuickBooks.