David Wang
-Updated on June 26, 2026
Why does my Macedonia Post number start with letters like RR, CP, or EE?
The opening letters follow the UPU S10 convention and signal the product class: "RR" and other "R" codes are registered mail, "C" codes such as "CP" are parcels, and "E" codes such as "EE" are EMS express items. The prefix is a strong indicator of the service but not an absolute guarantee, so use it alongside the receipt or shipping confirmation to confirm what you sent or bought.
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