Does the SMTP client support sending secured emails?
MDK-Middleware is installed and up to date in my 5.26 compiler version according to the Pack Installer. But the Run-Time Environment is grayed out in the drop down menu. What next?
If you have middleware, you must have a licence - and, thus, be entitled to support.
So may be easier to contact Keil support direct; then you will be able to share screenshots, etc - and not be limited by the forum.