Unless you're running your own local instance of the BlogSpam service should submit your to the following host:
Hostname test.blogspam.net Port 8888 Path /
If your XML-RPC environment requires you to specify an URL then you should use the following:
Available Client Methods
The RPC service we run exposes the following methods, which combined make up our API:
testComment( struct )
Test the content of the comment encapsulated in the given structure and return a string describing the result.
classifyComment( struct )
Train the given comment as spam, or ham, in the case of error.
Return the list of server-side testing plugins.
getStats( string )
Return the statistics for the current site.