Katalon Studio Windows 64 v5.4.1 - Email Notification Fails to Send in Console Mode

PC running Windows 7

On Katalon Studio Windows 64 v5.4.1, if the Project Settings - Email - Report Format - “Include report as email attachment” check box is either checked or it is unchecked, no email will be sent after a Test Suite is run using Console Mode (Command Line)…

Is there a solution for this? Because in Katalon Studio Windows 64 v6.3.2 this problem still occurs. Please inform me if there is a solution.