[SOLVED]

address goes bottom left if it's an envelope with a transparent window. (faster because the system that reads the address is automated)

address goes bottom right if the envelope has no transparent window.

stamp goes top right. (you can write down a code from the app called "Post & DHL").

[Solution 👆]

everyone claims it's the bottom right, but why every envelope with a transparent opening actually has the opening on the bottom left?

(I've seen some that have it on the bottom right tho)

this is really important, I'm sending important documents within Germany, I am too anxious to mess this up.

also, if I'm having a code, a digital stamp, should I write it on the top right?

thank you very much.