Parcel courier company City Link, which delivered goods from retailers including John Lewis and Amazon, went into administration over the Christmas period, leaving thousands of customers' deliveries in doubt.
It will no longer make deliveries and and its customers have been urged to make alternative arrangements for future deliveries.
Depots will reopen following the festive break from Monday 29 December 2014 "to enable customers or intended recipients to collect parcels", according to a statement published on city-link.co.uk.
Customers who left parcels with the company on Christmas Eve – the date its entering administration was announced – for delivery have been advised to retrieve them from the depot as soon as possible.
Any intended recipients who have been notified of a failed delivery have also been urged to do the same.
The company's online parcel tracking system is still working and customers can use it to find out whether they need to collect a parcel and where it is located.
City Link's usual helplines remain open on 08444 930 932.
One of the administrators, Hunter Kelly of accountancy firm EY, said City Link had experienced heavy losses over recent years brought about by "a combination of intense competition in the sector, changing customer and parcel recipient preferences, and difficulties for the company in reducing its cost base".
John Lewis has now transferred all its deliveries to alternative parcel couriers following City Link's administration.
Roger Sumner-Rivers, founder of delivery company ParcelHero, has warned that City Link's failure could have adverse effects on the rest of the delivery market. He told Mail Online that the collapse has caused "serious concerns as to how the carriers left in the market are going to be able to absorb the estimated 76 million additional parcels City Link delivered each year".
He explained: "The companies will all require immediate service, which will put a huge burden on every carrier's infrastructure, from the sales department right through the network to the delivery couriers at the other end."