SMTP Client

Take another look at the documentation at the link provided earlier:
www.keil.com/.../use_secure_components.html

It shows the “Manage Run-Time Environment” window (http://www.keil.com/support/man/docs/uv4/uv4_ca_rtemanager.htm).

Click on Network component and select “MDK-Pro” variant. Expand Network and Service and click on SMTP Client and select SMTPS variant.

Note: you need MDK-Middleware pack installed (comes pre-installing MDK)

Take another look at the documentation at the link provided earlier:
www.keil.com/.../use_secure_components.html

It shows the “Manage Run-Time Environment” window (http://www.keil.com/support/man/docs/uv4/uv4_ca_rtemanager.htm).

Click on Network component and select “MDK-Pro” variant. Expand Network and Service and click on SMTP Client and select SMTPS variant.

Note: you need MDK-Middleware pack installed (comes pre-installing MDK)

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.