1 Hashcash is a denial-of-service counter measure tool. It's main current
2 use is to help hashcash users avoid losing email due to content based
3 and blacklist based anti-spam systems.
5 The hashcash tool allows you to create hashcash tokens to attach to
6 emails you send, and to verify hashcash tokens attached to emails you
7 receive. Email senders attach hashcash tokens with the X-Hashcash:
8 header. Vendors and authors of anti-spam tools are encouraged to exempt
9 mail sent with hashcash from their blacklists and content based