Post office customers are unhappy with the services they currently receive, a survey by consumer watchdog Which? has claimed.
The results come as the government and Royal Mail discuss the future of many regional post offices, which face closure to stop the mail operator's rising losses.
Which? found that about a third of its members were annoyed with junk mail, while 21 per cent were worried about post office closures. Fifteen per cent were concerned about having items lost in the post, while 11 per cent were concerned about long queues at post offices.
Of the 1,029 Which? members surveyed, 16 per cent said they were very satisfied with Royal Mail services and 28 per cent were very satisfied with post office services.
Neil Fowler, the magazine's editor, said: "In most cases, if you are unhappy with a service provider you can easily switch to another one, but postal services are the exception to this rule with a real lack of choice available.
"There are ways in which you can improve the service you receive, by taking steps to reduce junk mail and claiming compensation where applicable."
Which? recommends that anyone concerned about post office closures should contact Postwatch to ensure their voice is heard in the public consultation.
Speaking on the findings, a spokesperson for Royal Mail said: "The facts are that our own monthly market research has consistently shown that around 92 per cent of people are satisfied with Royal Mail and around 89 per cent for the Post Office - and it has been acknowledged by Postcomm and Postwatch that we are delivering the best quality of service on record."