As you've already read in page "Registration"
your account will be stored in the system till you’re using it (sending letters). Unfortunately database is not unlimited and your registration will be deleted if there were no any letters for the last two months. This limitation does not consider users who support the service financially (or by other way) in which case account will be stored during two years.
The service needs stamps, envelopes, paper, cartridges/toner for a printer and all kind of computer/network hardware. You may support the service by sending me some of those items or money (check, money transfer). Necessary data can be found at "How to pay"
All the money will be spent to pay for the letters of senders who are not able to do so by themselves.