POSTAL workers have urged people to avoid using red envelopes to send their cards this year.

At the busiest time of year for Royal Mail staff they are warning that their computers cannot read barcodes printed on red envelopes.

As a result, all this mail has to be sorted by hand.

The Royal Mail has recommended a series of last posting dates to ensure people get their cards in time for Christmas – second class is December 18, first class December 20 and special delivery, December 23.