Postcards . . . Packages . . . Letters
You can mail them all at your local Kontor Pos.
At the post office there is no line formation you just stand behind or beside someone and put your stuff on the counter before someone else does.
We took an excursion to the post office and learned how to get stamps, send off mail and packages and were also able to tour the post office building.
P.S. - If you send me a postcard or letter you might just get a postcard or letter back. =) 