On 1/9/2016 1:36 PM, Mark Sapiro wrote: > On 01/09/2016 06:14 AM, Dennis Putnam wrote: >> On some mailman lists I receive messages in which Thunderbird displays a >> "Reply to List" button. However, on my own lists that does not happen. >> What header is TB relying on to get that and what setting do I need to >> change my mailman for that to happen? TIA. > > Thunderbird and many other MUAs rely on the RFC 2369 List-Post: header > for "reply to list". There are six RFC 2369 List-* headers; List-Id:, > List-Unsubscribe:, List-Archive:, List-Post:, List-Help: and > List-Subscribe:. Mailman's adding of these headers is controlled by the > lists General Options include_rfc2369_headers and > include_list_post_header settings. > > If include_rfc2369_headers is No, none of these headers will be added. > If include_rfc2369_headers is Yes, List-Post: will be added only if > include_list_post_header is Yes, List-Archive will be added only if the > list is archiving and the other four will be added. > > So to ensure posts received from the list have a List-Post header, both > include_rfc2369_headers and include_list_post_header must be Yes. > > Also note that if your "Avoid duplicate copies of messages?" setting on > a list is Yes and you are directly addressed in a reply, the copy you > receive doesn't come from the list and won't have any Mailman headers. > > Thanks for the reply. Those options are and apparently always have been on. But none of those headers show up. I wonder if an SMTP server somewhere along the way is stripping them out for some reason.
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