lnadybal wrote:
"(...)With reference to the message below, the mail in Buesingen is
handled by the German post office... mail from outside that is
addressed to Buesingen using the Swiss code is delivered by the Swiss
post office in Schaffhausen to the Buesingen post office, which
distributes it.(...)"

Which is not really different from what I wrote. If you want your
mail to run via Switzerland, you can always use the Swiss postal
code, of course. But mail from Switzerland to Buesingen is regarded
as internal mail, and so is the postage rate.

In Buesingen P.O., the only thing that the mailman has to do is to
sort by street name and house number, or P.O. box, etc., because from
this point in the delivery chain the postal code has done it's duty
and is not needed anymore. Even so, awfully nice of the German
mailman that he also delivers the mail with a Swiss p.c. :-)

"(...)A number of military bases in Germany and Belgium also have two
or more postcodes and dialling prefixes, and a couple of them
actually have four or more postcodes from different countries.(...)"

As far as I know, there is one Belgian postal code for Belgian troops
in Germany. (By the way, I remember that there even are internal
postal codes in the Dutch army. Something like MPC+two digits, but
I'm not sure) Mail to the military sometimes is very peculiar: even
ships (like in the US Navy) sometimes have postal codes.

Peter S.