Hello,
Jochen ...

(And BTW "doofus" seems to be a funny word, never heard. It just catched my attention because in German the adjective "doof" exists which is translated by my dictionary to "stupid" or more seldom "boring" ...
)
The meaning is the same in English ...

(We probably "borrowed" the word from the Germans.) ...

BTW, Susan just returned from Fort Lauderdale with a wonderful Deutsche Post package from you. Vielen Dank, mein Freund! ...

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Everything arrived in perfect condition.
All the best,
Richard