Since version 3.0 it's possible to use e-mail templates within Admidio. This was a hidden feature because there was no preference that could be set or something like a documentation.
Now we have improve this feature within version 4.0 and therefore created a small documentation which also describe the usage in Admidio 3.x. So have a look at this documentation and have a small preview of a enhancement in the next version. (There is no release date now available for version 4)
Here you can read about it: