If you don't know how to interpret the results, send a copy to the support department of the provider and ask for their evaluation of it. Also see the Group List section. If available, follow the link to see what's offered. In cases where no status page is offered, a link to the announce group may be provided. Being able to read that group before subscribing is dependent on whether your current provider carries it.
Most providers attempt to remove spam from their feed.
What is Filtered section. Some servers will remove messages when they receive a cancel message and some will not. You can issue cancels as always and those servers who honor them will still remove your message. Server side filters allow the removal of headers on the server prior to transmission. An example of such a premium service is ClariNet .