Mailer-Class Layout

Hallo,
I am reactivating the Mailer Class in my application.
Unfortunately I get confused with exact relationship between:
setTemplate
setLayout
setTheme
Is there an example somewhere in this world, to get an idea how these work together?
Regards Klaus

Hey Klaus,

did you read this already:
Mailer - 5.x

This explained the use of setTemplate and setLayout very well. I am using it likes its described there. But I am not working with setTheme