An arson investigation has been launched by police after a Grovehill postbox was set alight.
Firefighters were called to Crawley Drive, Hemel Hempstead, just before 9pm on Sunday. They used a hosereel to put out the flames.
A spokesman for Royal Mail said: “There was a small amount of mail in the box that was recovered and some of these items were damaged. We will be delivering these items of mail to the addressees, with a letter of apology for the damage caused by the fire.
“If any customer has a concern about mail they posted in the box, following the last collection on Saturday, they should contact our customer service team on 08457 740 740.”
Anyone with information is asked to contact police on the non-emergency number 101, quoting crime reference number D1/13/5551.