Provided by: spambayes_1.1b1+git20190201.1335ca8-1_all
sb_client - A client for sb_xmlrpcserver.py.
Just feed it your mail on stdin, and it spits out the same message with the spambayes score in a new X-Spambayes-Disposition header.
The full documentation for sb_client is maintained as a Texinfo manual. If the info and sb_client programs are properly installed at your site, the command info sb_client should give you access to the complete manual.