It's a job definition for SLAMD, useful for performance tests of various spamd
configurations. The job registers itself within SLAMD (2.0.0-alpha1) and can
talk to spamd using its spamc/spamd protocol as described at
http://spamassassin.apache.org/full/3.0.x/dist/spamd/PROTOCOL. 

INSTALL:
1. Install SLAMD server
2. Install and configure SLAMD clients
3. copy sa_slamd.jar to the slamd/webapps/slamd/WEB-INF/lib/ on server and
slamd_client/lib
4. start the SLAMD environment
5. Add a new job class in the SLAMD web interface
(org.apache.spamassassin.slamd.SpamRateJobClass)

HOWTO:
1. start your spamd, remember to use -i and -A for every client that may be
connecting to it (including SLAMD server)
2. prepare some test messages; make them available through HTTP of FTP. List the
URLS in a seperate file. Eg: messages are stored under http://example.com/msg1,
http://example.com/msg2, .., http://example.com/msgN. A list of these is stored
at http://example.com/msglist
3. define a new job in SLAMD:
- Description, Duration, Number of Clients, Threads per Client - to your liking
- Statistics Collection Interval - 2-10 [s]
- Spamd host, Spamd port - obvious
- Spamd user - user for spamd to process this message under
- Email List URL - URL to a text file containing URLs to messages to process
(see p. 2)
- the rest of the parameters is optional. 
[4.] Test the parameters
5. Start the job; see your spamd processing lots of messages.