Hashcash and ColdFusion

For anyone that wants to send out mail from ColdFusion
with hashcash, it's not hard. Here's some example code:

Didn't take much to get this working. There is
a command line executable at hashcash.org that
you can download. So, (after removing buncha
dynamic stuff for clarity here) it looks like this:


      <CFTRY>
          <CFEXECUTE
              name="c:\hashcash.exe"
              arguments="-mb22 [email protected]"
              variable="hashCashResult"
              timeout="5">
          </CFEXECUTE>

          <CFCATCH type="Any">
              <CFSET hashCashResult="">
          </CFCATCH>
      </CFTRY>


<CFMAIL
      TO="[email protected]"
      FROM="[email protected]"
      SUBJECT="Password Reminder"    >
Hello user,
The password for your account is: some_password

Cheers,
The Database
<CFIF Len(hashCashResult) NEQ 0>
      <cfmailparam
      name = "X-HashCash"
      value = "#hashCashResult#" >
</CFIF>
</CFMAIL>

Here is how much SpamAssasin adjusts the spam score based
on the number of bits used (22 in the above example)
Hashcash 20  bits -0.500
Hashcash 21  bits -0.700
Hashcash 22  bits -1.000
Hashcash 23  bits -2.000
Hashcash 24  bits -3.000
Hashcash 25  bits -4.000
Hashcash >25 bits -5.000

Cheers all,
Anders
+===========================================================+
|Anders Green                 Email: [email protected]       |
|                              Home: 919.303.0218           |
|        Off Road Rally Racing Team: http://linaracing.com/ |
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