What to do when I post serious Usenet messages but some user/s hassle by subject changing my post to “SPAM”?

Question by interactive_net: What to do when I post serious Usenet messages but some user/s hassle by subject changing my post to “SPAM”? I post on unmoderated Usenet groups. Not only the specific user/s change subject line, they also say “SPAM” only on message body. What can I say on the Usenet when this victimisation […]