The nightly mass-check setup on the SpamAssassin zone, spamassassin.zones.apache.org, uses helper "slaves" to actually scan the mail in order to reduce CPU load.
Setup
Here's how to set up a new slave.
Install perl, and all of SpamAssassin's required modules, and whatever modules are required for "mass-check" (see MassCheck) to operate.
make sure SpamAssassin's "make test" of current SVN trunk passes.
Create a user called "mccli". It does not need a password. This is the user the mass-checks will run as.
Generate an SSH key for that user:
sudo -u mccli -H bash ssh-keygen -t rsa
Add the master server's SSH key to '~/.ssh/authorized_keys':
curl http://bbmass.spamassassin.org/pubkey.txt > ~/.ssh/authorized_keys chmod 600 ~/.ssh/authorized_keys
Ensure the new slave's SSH server is accessible to the net, and allows logins as "mccli".
on the Zone, test it:
sudo -u bbmass -H ssh mccli@hostname.domain.com echo tst
You will be prompted to accept a new host fingerprint; you should then see the string "tst".
Once this works, edit trunk/build/nightlymc/clienthosts in SVN, and add the login username@host to the list:
mccli@host.domain.org mccli@another.domain2.org
The new mass-check client should be used in the next nightly mass-check (depending on when the "nightly" tag is applied).