hashcash addition for qmail scanner

Hello all,

First of all, I would like to extend thanks to Jason Haar and the
community for such wonderful software.

I have been running qmail scanner for a while, and I had the idea of using
it to add hashcash headers to outgoing emails.  I got most of the way
through creating the code to do this when I realized spamassassin (with
some configuration) might already have a means of doing this.  Is this
indeed possible?  If it is not, is anyone interested in this
functionality?

I am just going to throw the additional function I added to
qmail-scanner-queue.pl here at the bottom of the email to invite comment,
as I don't want to create a patch if I someone is going to tell me I don't
need to.

This function is activated by adding "hashcash" to the @scanner_array
variable.

sub hashcash {
  my $dohashcash = "1";
  my $addhashcashheader = "1";
  my $hashcashcmd = "/usr/bin/hashcash -m -X ";

  if ($dohashcash) {
     &debug("Starting HASHCASH creation function");

     #Don't bother if this is going to be quarantined
     return if ($quarantine_event);

     #grab all addresses that are not bound for this server
     my ($hashaddr,$addr,$dom) = "";
     # is this a safe way to split?  It works so far for my testcases...
     my @addrlist = split(/,/, $recips);
     foreach $addr (@addrlist) {
        foreach $dom (@local_domains_array) {
         if (!($addr =~ /$dom$/i)) {
           $hashaddr .= $addr . " ";
         }
       }
     }

     # only run hashcash if we have (an) address(es) not bound for this
server
     if ($hashaddr && $addhashcashheader) {
        &debug("HASHCASH addresses: $hashaddr");
        my $hashheaders = `$hashcashcmd $hashaddr`;
        &debug("HASHCASH headers: $hashheaders");
     }

     # insert hash headers into email...
  }
}



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