Yes.  Some subscriber to the list receives a message from
the list, and that recipient's Mail user Agent thinks that
the message might be spam, so that MUA adds "[Spam?]"
to the Subject" line.  If that recipient then replies to the
list, that new Subject: line will appear in his/her reply.
Mailman has no method for changing the Subject: line.
A subsequent recipient who replies to the list has the option
of changing the Subject: line to remove this addition.

--Barry Finkel



On 12/8/2021 2:30 AM, Christian Buser via Mailman-Users wrote:
Good morning

This can be inserted by ANY server between the sender and the recipient. You 
have, afaik, no chance to find out which server this was. And I think it 
wouldn’t help anyway since you cannot take influence on the way which the 
messages travels.

Christian

Hello Adam Morris. On Wed, 8 Dec 2021 17:10:13 +1100, you wrote:
Hi all,
I realised I asked about this recently.
on lists I run I don't have this appearing in subject lines where
messages are sent from g mail and other domains.
For a list I don't run messages sent from g mail and other providers
have this in the subject line.
Wondering what settings need changing on the list this is happening with?
TIA.

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