An Post is reminding people that it's the last day to send cards and parcels to guarantee they'll get there by Christmas.
Officials say today is the last day for regular postage 'to be sure of' delivery nationwide.
Final delivery is this Saturday, with Post Offices closing at 1.30pm.
Services will resume again on December 28th.
An extra 300 staff were hired to help with the increase in demand this year, and staff are said to be working around-the-clock.
Anna McHugh from An Post explained: "There's still a little bit of leeway - but if you want to be absolutely sure [of delivery], get them in the post today.
"We're working 24 hours a day and volumes are very high. We say to people check those addresses; seal those envelopes; and if you're sending parcels use lots of strong paper, lots of tape, and always include a return address."