Two directors of a private mail firm who admitted dumping more than 360,000 letters have been jailed for two years.
The mail was dumped in rubbish skips across London
Inderpal Narula and Royston Heaton ran Mail Logistics in Acton, west London, and netted up to £1m a year.
They arranged for international mail, from firms including Royal Mail, to be put in rubbish skips across London.
Det Sgt Peter Foley said: "This is the largest case of mail destruction ever investigated and the sheer volume of people affected is incredible."
Narula was ordered to pay £500,000 and Heaton, £400,000 in compensation.
Passing sentence, Judge Andrew Goymer gave them four months to find the money.
The proceeds will be divided between victims of the scam, including Tottenham Hotspur Football Club, Amnesty International and the British Medical Council.
Narula, of Green Lane, Burnham, Berks, and Heaton, of Holton, Oxford pleaded guilty to conspiracy to defraud between March 2001 and May 2002.
Zhivko Antov, who was responsible for discarding parcels and letters using a fork-lift truck, was given a nine-month suspended sentence after admitting to the same charge.
Mail Logistics was approached to deliver post in bulk internationally and at a cut price. Their charges for distribution ranged from £1 to £100.
The court heard Narula and Heaton pocketed £1m each in 2002 by not paying for the mail to be delivered.
The pair used their money on luxury houses and fast cars, while Antov received only his normal wages and the price of his air fare to Bulgaria.
Royal Mail became suspicious after receiving complaints from overseas magazine subscribers who had not received their orders.
Hundreds of copies of Geo-Scientist and Majesty Magazine were found in a skip at the firm's premises.
Nigel Seed QC, said: "As well as small companies who lost out as a result of the non-delivery of mail, individuals missed out on mail which was vitally important to their lives.
"Officers found leaflets and letters from the charity Amnesty International as well as letters of certification allowing doctors to work overseas from the British Medical Council."