[Mailman-Users] Reply-To-List Header

[Dennis Putnam]

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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