Items of Christmas post were destroyed after a fire was started in a Royal Mail post box.
The post box was targeted on Sunday evening
The blaze happened in School Road, Peterculter, Aberdeen, at about 1930 GMT on Sunday.
Grampian Fire and Rescue Service attended and extinguished the post box fire.
Royal Mail said a small percentage of the 50 items that were in the box were destroyed. Grampian Police appealed for information.
A Royal Mail spokeswoman said: "A relief collection of mail from this box had taken place on the Sunday afternoon and there were 50 items of mail in the post box at the time of the fire.
"The damage was minimal but unfortunately a small percentage of the mail was destroyed, all other items were delivered as normal. The post box has been cleaned and was back in operation on Monday.
"There is very little we can do to prevent this kind of incident - it is the result of the dangerous and irresponsible activities of an individual or individuals and this sort of petty crime affects our customers as it is their mail that may be damaged or destroyed as a result."
Anyone concerned about mail that may have been posted in the box before the fire can contact Royal Mail on 0845 774 0740.