From the QuickBooks Edit menu, choose Preferences, then select Send Forms. Select Web Mail, then Add. Choose your provider from the drop-down and enter your email address. make sure that the utilization Enhanced Security checkbox is checked, then select OK. If you not able to solve this, then call customer service - 1-855-481-5338. Visit- https://accountingerrors.com/quickbooks-couldnt-connect-to-the-emai...