Email Title to specify enviroment.

We have multiple Windchill Enviroments and no real way to see where emails come from.

like subscription, task, error emails all look basicly the same.

Seaching for an clear answer seems to be impossible, i tested a few mentioned options but they don’t seem to work. I should be able to change the email templates but its not working as documented. 

I have made an custom.properties file that contains the enviroment name.

Restarted server to clear cache etc. 

Please is there a clear instruction to alter said items to include a custom enviroment name in the email titles.