The `Newsgroups:' line isn't limited to just one group--an article can be posted in a list of groups. For instance, the line
posts the article to both the groups
It's also suggested that if an article is crossposted a `Followup-To:' header be included. It should name the group to which all additional discussion should be directed to. For the above example a possible `Followup-To:' would be
which would make all followups automatically be posted to just
Certain newsreaders will use this to sense that a reply should never be posted back onto The Net. This is often used with questions that will yield a summary of information later, a vote, or an advertisement.
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National Technical University of Athens