-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Michel Vaillancourt wrote: > decoder wrote: >> Hello there, >> >> since SpamAssassin supports the hashcash signatures but support >> for MUAs is rare, I wrote a plugin which is able to stamp all >> outgoing emails of a postfix server. If anyone is interested in >> testing this alpha version of the content_filter, please mail me. >> >> >> Chris > > What exactly is this going to achieve? I'm not familiar with using > HCS (hashcash signatures). I'm running Postfix on all my boxen, so > I'll be happy to test it for you, either way. > > --Michel Vaillancourt Wolfstar Systems www.wolfstar.ca
Well, you can read about the hashcash system at hashcash.org, basically, it is a per recipient hash generation that assures that a specific amount of time was required to compute this hash per recipient. Spammers don't have this time, they send thousands of mails per minute. The problem I saw was, that hashcash isn't supported very well on the sending side, there are some plugins/ways to integrate it into mutt and some other MUAs, but many popular ones are missing. Also, I'd prefer a plugin on the MTA so my users don't get bothered with this stuff. My plugin does that for postfix, it puts a hashcash stamp in every outgoing mail header for every recipient. SpamAssassin supports verification of these hashes (this is enabled by default, you only need to configure the mail adresses you accept mails for in the local.cf (http://spamassassin.apache.org/full/3.0.x/dist/doc/Mail_SpamAssassin_Plugin_Hashcash.html) I will send you the plugin this evening so you can try it out (as I am currently on a run:)) Chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFE4zhNJQIKXnJyDxURAtUVAKCS7AQixJGrtrqGSHlzRgFo7HCs6wCgtYfp V2WUw7wFIawo433miPYlsZ0= =VD4O -----END PGP SIGNATURE-----
