There is no direct postal service to Palm Beach, Aruba. Aruba's national postal operator (Post Aruba) discontinued dedicated service to this resort area.
Current workarounds:
For letters: Use PostNL international rates (€1.50–€3.50 for standard letter to Caribbean Netherlands). For packages: Compare couriers—DHL often best Caribbean network.
Always include: "ARUBA" in caps, phone number, and "DUTCH CARIBBEAN" on customs forms.