An Post has said the issue of staff off work due to Covid is placing a strain on their delivery services.
It says there has been a “significant increase” in the number of staff not at work.
In some situations post offices have had to temporarily close.
A spokesperson said “This is placing a temporary strain on our resources which may impact on our regular service delivery levels across our Mails & Parcels delivery network, and at some Post Offices.
“We have a range of contingency plans in place, and our staff and Postmasters are working hard to minimise the impact on customers.
“We apologise for any inconvenience this situation may cause. The Health & Safety of our Staff and Customers is our priority.
“Where any post office has to temporarily close, Social Welfare benefit payments will be transferred to a neighbouring office.”