Comment 63 for bug 119899

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In , Jdg-diogenes (jdg-diogenes) wrote :

I've always been able to filter messages to a Yahoo or Google group by adding "Reply-To" as a custom header and filtering on "Reply-To: <email address hidden>".

As for the "Newsgroups" header, that belongs to Usenet news, not mail. News filtering is handled separately and doesn't support custom headers yet. You may want to vote for bug 16913 which addresses that problem.