Some shipping methods are not available?

> I have UPS express and USPS global mail defined as shipping methods.
> However, when I try an order from germany, I can only use the UPS
> express. The global mail is not a choice.

With real-time shipping rates system gets shipping rates from UPS or USPS servers in real-time. If rates to this location are not provided by their servers, this shipping method is not available.