Greenmail.

Greenmail is a cut above ordinary email because it makes messages safe using bespoke encryption technologies, prevents spam junk mail, stops people sending mail to the wrong recipient, tells the sender when their message has been read, and gives a genuine recall facility if the sender gets it wrong--which can save red faces all round! Greenmail doesn't require the users email addresses to be changed: it can be configured to pick up mail from existing POP or web mail accounts. As well as making email private and safe, Greenmail aims to reduce paper usage, postage costs

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Paul Mustoe, CEO of Link Information Systems, explains: Normal email systems are green but they aren't sufficiently safe for carrying important postal items which, for example, may contain sensitive personal and financial infomation-We've probably all heard of the recent, well-publicised scams on banks and credit card processors--which is why banks have been reluctant to go greener and save money by communicating with customers electronically.'

'Greenmail changes this situation by making email trustworthy and secure. It encourages users to send important items by email rather than post, which they might have been reluctant to do previously.

http://wwwgreenmail4me.com