Penny Black Penny Black The Penny Black was the world's first adhesive postage stamp used in a public postal system. It was first issued in Great Britain on 1 May 1840, but was not valid for use until 6 May. It features a profile of Queen Victoria. In 1837, British postal rates were high, complex and anomalous. To simplify matters, Sir Rowland Hill proposed an adhesive stamp to indicate pre-payment of postage. At the time it was normal for the recipient to pay postage on delivery, charged by the sheet and on distance travelled. By contrast, the Penny Black allowed letters of
Penny Black (research project) spammers. Using these methods to reduce spam will also require these policies to be universal amongst mail clients. Intended mass email may also not work as intended. For example, subscribers to a particular email service may end up getting their emails with a significant delay while the email service will also become an increased expenses to the provider. Penny Black (research project) The Penny Black Project is a Microsoft Research project that tries to find effective and practical ways of fighting spam. Because identifying spams consumes a recipient's time, the idea is to make the sender of emails "pay" a