The Greek post office is called ELTA and you can find Nea Anchialos Post Office is located at Ellinikis Aeroporias Str. (City Center). Phone: +30 24280 76208
The post office performs money transactions and cash currency exchange. Post Boxes in Greece are YELLOW for normal post, usually with 2 slots for INTERNAL POST (meaning inside Greece) and post for ABROAD.
RED Post Boxes are rarer and they are used for URGENT mail. REGISTERED mail is always handled and given a receipt for at the POST OFFICE.