Post

The postal system varies from country to country, but, as a general rule, services are slow but reliable. Packages are usually sent from a separate counter or even a different office; note that some will require that you show them the contents of any package so don't seal your box until you're in the office itself.

In some circumstances, international courier companies charge rates that aren't all that much more than government postal rates, and they're usually quicker and more reliable.