My news server doesn carry the decade groups, so I can crosspost to them. Can I?
Sure you can. When you crosspost, the information in your “newsgroups” header propagates to the other servers along with your post. As long as your server carries at least ONE of the groups listed in the header, then it should accept your post and propagate it (and all of the header information) on to other servers. And if those other servers carry the decade groups, then pointers to your post will appear in all the specified newsgroups.
