Postal service during Easter time

Does anyone know what the postal hours are around the Easter holiday? i.e. Open/Closed/reduced hours on Good Friday? Open Saturday between Good Friday and Easter? Open on Easter Monday? etc. I will have a large bag I want to send to CasaIvar for safe keeping from Oviedo since I will be there from the Thursday before Good Friday through Holy Monday. We will be walking the Porto Coastal route and don't want to take it to Portugal prior to sending on if possible.

I have looked but can't figure out what was done in prior years. I appreciate any help. Thank you