No really sure what you mean, but doesn't "Reply All" do the trick; i.e. reply to the list/newsgroup, not to the individual who sent the mail?
h: Kristian
Yes. But is customary to reply *only* to the list, unles the individual has specifically requested a CC. In Thunderbird this must still be fixed manually, because a Reply All gives you the individual as the TO and the list as the CC. So you you would need to delete the individual and change the list from CC to TO.
-Roberto
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