[1] RFC 5536 - Netnews Article Format ( ( 版)) <http://tools.ietf.org/html/rfc5536#section-3.2.6>
[2] RFC 850 2.2.3 Followup-To
This line has the same format as Newsgroups. If present, follow-up articles are to be posted to the newsgroup(s) listed here. If this line is not present, followups are posted to the newsgroup(s) listed in the Newsgroups line, except that followups to "net.general" should instead go to "net.followup".
この行は Newsgroups (新聞組) と同じ書式です、 この行がある場合、返信記事はここに列せられた新聞組に投稿 します。この行が無い場合、「net.general」の返信を 「net.followup」にすべきことを除いては、 返信は Newsgroups 行に列せられた新聞組に投稿します。
[3] RFC 1036 2.2.3. Followup-To
This line has the same format as "Newsgroups". If present, follow- up messages are to be posted to the newsgroup or newsgroups listed here. If this line is not present, follow-ups are posted to the newsgroup or newsgroups listed in the "Newsgroups" line.
If the keyword poster is present, follow-up messages are not permitted. The message should be mailed to the submitter of the message via mail.
「poster」(投稿者)という語が指定されていたら、 返信メッセージは認められません。メッセージは メッセージの送信者にメイルで送るべきです。