Re: What causes mailing list bounce?

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> Date: Monday, June 19, 2023 07:19:33 -0700
> From: stan via users <users@xxxxxxxxxxxxxxxxxxxxxxx>
>
> On Sat, 17 Jun 2023 10:49:48 -0400
> Robert McBroom via users <users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> 
>> Received a strange message from the kde list.
>> 
>> ---------------------
>> 
>> Your membership in the mailing list kde-linux has been disabled
>> due to excessive bounces The last bounce received from you was
>> dated 09-Jun-2023.  You will not get any more messages from this
>> list until you re-enable your membership.  You will receive 2 more
>> reminders like this before your membership in the list is deleted.
>> 
>> _________________
>> As far as I can tell mail from all the other traffic on other lists
>> is coming through with no problems. I'm using Thunderbird with
>> Yahoo.com as my mail service.
> 
> I think bounces are when a destination rejects email for transit.
> Usually this is because of the rules they have implemented to filter
> spam.  I've read that Yahoo is notorious for this.  Maybe someone
> else can shed more light.  From the perspective of the kde list,
> this appears to be a mail address that has gone stale, and so they
> stop sending to it.

Another issue on this relates to DMARC. If the mailing list doesn't
rewrite the From: header and your mail service provider's servers
enforce DMARC (DKIM/SPF), your mail service provider's servers will
reject messages from list senders whose domains have DMARC set. You
can often get a hint of this if you see messages on a list with
replies to messages that you haven't gotten. E.g., you never see
messages from person X, but you do see replies to their messages on
the list or their messages are in the list archive.

Mailman 3 has the necessary tools for dealing with this, but it looks
like mail.kde.org is still running version 2. So my guess is that
they aren't doing header rewriting, and that that's likely your
issue. You'll need to take this up with them.

See: <https://dmarcian.com/mailing-lists-dmarc/> for a very quick
intro to this issue.

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