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Kevin J. McCarthy authored
Mention in both the "Mailing Lists" and "Handling Mailing Lists" sections the difference between known and subscribed mailing lists. Note that the Mail-Followup-To header is generated if any of the recipients are known mailing lists. If any of those are subscribed mailing lists, the sender's address will not be in the header. If all of them are known (but not subscribed), the sender's address will be added to the header.
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