Translation of bulletproof in German

Sometimes you forget one word and this makes the entire sentence sound differently. That means that you need to read each email before sending it twice at least if you want to be on the safe side every time.
In the attachment you will find the reviewed documents. Your Portuguese is quite good. I understood everything. If you write the same text in German, I can know what you wanted to say.
I will be doing my second year of studies abroad, probably in Panama. For that I will really want to learn Spanish. I know little about the Spanish language, but I will learn. I can help you with German.