In IoTSec.no we have an "create Action Item" form. Is there a chance that the "responsible" for that action item are informed by email when such an Action Item is created?
It has a history of being a bit flaky and not kept up to date though. We will need to install it and see if it still works with the versions of MW & SMW you have installed. If it does still work it should do exactly what you need and more.
I don't really want to use an extension:
"This extension is currently not actively maintained! Although it may still work, any bug reports or feature requests will more than likely be ignored."
Thus, we might close this issue - and wait for a solution in the future