David Wang
-Updated on June 26, 2026
What does RD mean on a South African Post Office tracking number?
An RD prefix marks a registered document or registered mail item, the most common registered prefix on SAPO mail (for example RD123456789ZA). Registered items are tracked at each scan point and require a signature on delivery, which makes them easier to trace if a claim is needed. The "R" denotes the registered class under the UPU S10 standard.
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