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using hashcash in procmailFirst you will need to install the hashcash tool if it is not included with your distribution. This came from Kyle Hasselbacher's example:
which should deliver to DEFAULT anything with a valid X-Hashcash: header addressed to adam@cypherspace.org. More advanced stuff (multiple addresses):
which should deliver to DEFAULT anything *@*.hasselbacher.org or *@*.toehold.com. The $MATCH is the stuff after the / so you can use procmail regexps to specify what email addresses are valid for you. |