The Netnews message headers are defined in RFC 1036 (Standard for Interchange of USENET Messages).
Posting the same article to separate groups is called crossposting. Enter on the Newsgroups: line the names of all the groups to which you want to post. Separate the names by commas:
If your newsreader has a non-conforming user interface, you may need to refer to its documentation.
Before you crosspost, you must make sure that your article is appropriate for all the groups to which you plan to post it. Even if the article is on topic, some servers may drop it because they are configured to throw away crossposted articles. In addition, if one or more of the groups to which you are crossposting is a moderated group, your article will not appear in any group until a moderator has approved it.
Do not confuse crossposting with multiposting, which means posting separate copies of an article to different groups. Multiposting wastes resources and is almost never acceptable.
Most news servers are not open to the public, just to users from specific hosts (such as those on the local network or of the same ISP) and/or to users who have an account on the server. To prevent spam, the server may also allow certain classes of users to read news but not to post.
The organisation that provides you with Internet connectivity may also give you access to a news server. If it does, that may be the best means for you to access Netnews.
There are also public news servers that you can try. However, your access privileges on such servers may be highly restricted. If a server appears to have been left ‘open’ accidentally, I advise against using it.
There really is no such thing; every news server has its own file of ‘active’ groups.
Because of the above, the appropriate active file for you (as a client) to use is the one your newsreader downloads from your news server. However, you can also download reasonable starting-point active and newsgroup (description) files from the Internet Software Consortium.
…is available on the news.newusers.questions site.
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