A Followup-to (or shortly fu2) is made to specify on which forum, mailing list or newsgroup the replies to a crossposted message should be published.
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In a crossposting, even if it is possible that the answers to the initial message are all crossposted to the same groups, this situation should be avoided because there is (almost) always users who either do not want either can't continue this crossposting.
If so many users stop the crossposting, and if they are on different groups, then the thread broke out between these groups, which leads to great difficulties to follow this thread. The correct solution is that one of the initial crossposters (preferably the first) chooses one of the groups as Followup-to and indicates it to other users.
Such Followup-to group may be different from that (or those) of the original message. This lets you choose a more appropriate group for the thread, making so a redirection. In this case the poster should not only indicate that it is redirecting to (fu2) the new and more appropriate group, but also make a full quotation of the redirected message (usually the initial message of the thread), so that readers of the new group are informed of the question.
On Usenet, a Followup-to will be indicated by a line like
Followup-To: name_of_followup-to_group
This line indicates that the subsequent answers to the current message should be made in the newsgroup indicated just after the semi-column.