NAME

Mail::SpamAssassin::Plugin::Hashcash - perform hashcash verification tests

SYNOPSIS

  loadplugin     Mail::SpamAssassin::Plugin::Hashcash

DESCRIPTION

Hashcash is a payment system for email where CPU cycles used as the basis for an e-cash system. This plugin makes it possible to use valid hashcash tokens added by mail programs as a bonus for messages.

USER SETTINGS

use_hashcash { 1 | 0 } (default: 1): Whether to use hashcash, if it is available.
hashcash_accept add@ress.com ...: Used to specify addresses that we accept HashCash tokens for. You should set it to match all the addresses that you may receive mail at.; Like whitelist and blacklist entries, the addresses are file-glob-style patterns, so friend@somewhere.com, *@isp.com, or *.domain.net will all work. Specifically, * and ? are allowed, but all other metacharacters are not. Regular expressions are not used for security reasons.; The sequence %u is replaced with the current user's username, which is useful for ISPs or multi-user domains.; Multiple addresses per line, separated by spaces, is OK. Multiple hashcash_accept lines is also OK.
hashcash_doublespend_path /path/to/file (default: ~/.spamassassin/hashcash_seen): Path for HashCash double-spend database. HashCash tokens are only usable once, so their use is tracked in this database to avoid providing a loophole.; By default, each user has their own, in their ~/.spamassassin directory with mode 0700/0600. Note that once a token is 'spent' it is written to this file, and double-spending of a hashcash token makes it invalid, so this is not suitable for sharing between multiple users.
hashcash_doublespend_file_mode (default: 0700): The file mode bits used for the HashCash double-spend database file.; Make sure you specify this using the 'x' mode bits set, as it may also be used to create directories. However, if a file is created, the resulting file will not have any execute bits set (the umask is set to 111).