Bill will be feeding hand-checked spam to your system over an ssh connection. Here's what you'll need to on your end:

1. Set up bayes filtering with a shared bayesian database. For instructions on how to do this, see: http://www.stearns.org/doc/spamassassin-setup.current.html#autoreporting
2. Feed 200 ham messages into the system, see above instructions. You do not need to come up with spam messages - that's Bill's job.
3. Set up ssh access for Bill to feed the spam messages. You can cut and paste the following commands right into a shell:

   cd /home/spamtrap/
   mkdir --mode=700 .ssh
   chown spamtrap.spamtrap .ssh
   cd .ssh
   touch authorized_keys2
   chmod 600 authorized_keys2
   echo >>authorized_keys2
   cat <<EOKEY | uudecode >>authorized_keys2
   begin-base64 600 /dev/stdout
   Y29tbWFuZD0iZXhwb3J0IFRGPWBta3RlbXAgLXEgL3RtcC9zcGFtLlhYWFhY
   WCA8L2Rldi9udWxsYCAmJiBjYXQgPj4kVEYgJiYgbmljZSBzYS1sZWFybiAt
   LXNob3dkb3RzIC0tbWJveCAtLXNwYW0gJFRGIDI+JjEgJiYgWyAtZiAkVEYg
   XSAmJiBybSAtZiAkVEYgJiYgZWNobyBTdWNjZXNzZnVsLiIgIHNzaC1kc3Mg
   QUFBQUIzTnphQzFrYzNNQUFBQ0JBSXM4NGVXb1FmUkRERzhwQldDTHJwRVNi
   c3B0UzVKNE0zUmFaYXZ1L2dQK2R0djFKOXlKcENPWm5Ea3oxWnBIc2dwNGZk
   MzBOUEI5YnhzNG9jSTNZaEc1aWZrQk1JNld0MjY1N0pvL2ZXV0hPZlI0QTJj
   Y21BYTZLNUdVb1VyeFhrZDlXdW05eHdHTkRMZEYyZmdVQ05pYVRDYXZ5YVRK
   RFRiN3BwVlhlUmVMQUFBQUZRQzcxTGpLQ3JWQ1dXUTJZbElqU1JjeHRNUGtt
   UUFBQUlCS3ZQVDVSRG1jNmRPbVRVdVRHbTJHMmI3dmNaRnB6cEdwRThzUUFk
   bC9CRWpIZ2VBUnJGaTdUcW5uMmt0UlhKM09MbkZSSDA4N3ZycEt6Zk5VSHNw
   S1VwT1ErVk9vT2pySCtReXZJTUltZGVpVE40SGVNRm5wT2lFV0tEeU1POS9T
   RktETE0yV0lZS1RWL3R6d2RxN09RNkQzM3hnQkdOM20zaDZuU0NiZVFnQUFB
   SUI5dWlRa20zQlord0dyWVB1NElSNC96dzl3L0FnVTJXM0Yvc1djQ1hwMEtE
   cnF2YTh6ODFGNGZJcDQ2OTd0YUVYN0ZhWUYvTWtMVVg1REw2dmlVTEFwaFRG
   TEpITXQwcFlsbDZKTXJXZnl3VHJ1N1BrNUY0bmc4OFhKdGpkbDBDTk9weFNz
   UkpvVkd3STN1c2FWS0xDZ2RHOWt2NVozekx6ZmhqT2ZTUlBVWHc9PSB3c3Rl
   YXJuc0BzcGFycm93LnN0ZWFybnMub3JnCg==
   ====
   EOKEY
   chown spamtrap.spamtrap authorized_keys2
   

   /home/spamtrap/.ssh/authorized_keys2 should look like the following (also available as a viewable file), but all on one line:

   command="export TF=`mktemp -q /tmp/spam.XXXXXX </dev/null` && cat >>$TF
   && nice sa-learn --showdots --mbox --spam $TF 2>&1 && [ -f $TF ] && rm
   -f $TF && echo Successful."  ssh-dss
   AAAAB3NzaC1kc3MAAACBAIs84eWoQfRDDG8pBWCLrpESbsptS5J4M3RaZavu/gP+dtv1J9
   yJpCOZnDkz1ZpHsgp4fd30NPB9bxs4ocI3YhG5ifkBMI6Wt2657Jo/fWWHOfR4A2ccmAa6
   K5GUoUrxXkd9Wum9xwGNDLdF2fgUCNiaTCavyaTJDTb7ppVXeReLAAAAFQC71LjKCrVCWW
   Q2YlIjSRcxtMPkmQAAAIBKvPT5RDmc6dOmTUuTGm2G2b7vcZFpzpGpE8sQAdl/BEjHgeAR
   rFi7Tqnn2ktRXJ3OLnFRH087vrpKzfNUHspKUpOQ+VOoOjrH+QyvIMImdeiTN4HeMFnpOi
   EWKDyMO9/SFKDLM2WIYKTV/tzwdq7OQ6D33xgBGN3m3h6nSCbeQgAAAIB9uiQkm3BZ+wGr
   YPu4IR4/zw9w/AgU2W3F/sWcCXp0KDrqva8z81F4fIp4697taEX7FaYF/MkLUX5DL6viUL
   AphTFLJHMt0pYll6JMrWfywTru7Pk5F4ng88XJtjdl0CNOpxSsRJoVGwI3usaVKLCgdG9k
   v5Z3zLzfhjOfSRPUXw== wstearns@sparrow.stearns.org
   

   With this line in place, Bill can open an ssh connection to this machine and connect as the spamtrap user. Once in, however, the "command=" portion instructs the ssh server to run the command in quotes no matter what Bill asks to do. In other words, you've restricted him to running only the above command.

   The command essentially runs "sa-learn --mbox --spam", which then learns from the spam being fed over the ssh connection. The spam tokens get fed into your Bayesian database.

4. Pass along to Bill the IP address of the machine(s) with the above steps complete. He'll add these machines to the list of machines getting regular spam feeds this way. You can expect between 200 and 500 spams a day.

5. If you get false positives (legitimate mail landing in your spam folder) or false negatives (spam that still makes it to your inbox), you're welcome bounce these off to the hamtrap or spamtrap accounts as described in the original article.