L-Mail. The postal service for geek grannies everywhere. Oh yes!
‘Send your letter online. L-mail lets individuals and businesses send letters to any postal address via the Internet. We print and post letters from 13 worldwide locations and even lick the stamps for you!…Once you click ‘send’ L-mail route your electronic letter to the nearest printing station to the recipient. A copy of your letter is emailed back to you for your records…We print your letter, put it in an envelope and send it on its way by mail using the local postal system.’
[Update: Actually look again, ‘cos it’s quite clever really.]