sedamo is a way to exchange postal addresses (mailing addresses) easily using a 8-letters code, the international address code.
The receiver (once) looks-up the address code of her/his (destination) address.
This address code is forwarded to the sender.
The sender uses the address code to print out the (foreign) address in an international format (as recommended by the Universal Postal Union).
Because the recipient´s address is written in the native language of the destination country, the shipment is delivered as quickly as possible.