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

         loadplugin     Mail::SpamAssassin::Plugin::Hashcash

       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.

       use_hashcash { 1 | 0 }   (default: 1)
           Whether to use hashcash, if it is available.

       hashcash_accept addATress.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

           Like whitelist and blacklist entries, the addresses are file-glob-
           style patterns, so "friendATsomewhere.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:
           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

           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).

perl v5.10.0                      200Mail::SpamAssassin::Plugin::Hashcash(3pm)