(sorry, I did not reply to the list with this at first)
Hi,
I'm quite positive that Mailman 3 is the culprit here. The problem did not exist with Mailman 2 and both versions used the exact same MTA. This MTA is even set up in a way to explicitly circumvent spam filtering (mails are filtered on the way in to mailman, there is no need for an additional check on the way out) . Additionally if the MTA would reject connections from IPs that generate too many errors, then why is Mailman 3 still able to deliver to domain B and C when domain A has already failed?
Currently I am trying to write a script to check if mail aliasses are alive and remove users if that check should fail. I plan to run this as a cron job for every list every night. I don't think that this is a good option, but I don't see anything better right now.
Julian
Am Tue, 12 Jul 2022 10:45:16 +0100 schrieb Tim Cutts <tim@thecutts.org>:
Are you sure that’s mailman doing that? What do your MTA logs say? I’ve certainly seen behaviour that looks like that in the past, but usually my MTA logs show that the first few are accepted by the remote site, and then the subsequent messages get rejected, usually as a result of over-zealous spam filtering. My approach to that has usually been to adjust my MTA settings to be a bit friendlier to the sites that tend to do this, and only send a few messages at a time.
Tim
On 12 Jul 2022, at 08:34, Julian Kippels <kippels@hhu.de> wrote:
Hi,
We have recently upgraded from Mailman 2 to Mailman 3. Since then I have observed many user reports that mails to mailing lists don't reach all members. My suspicion is that there are too many "dead" members on those lists. This was not a problem on Mailman 2, but has become a problem on Mailman 3. It seems to me that for example Mailman 3 sends mails to the first 5 existing member addresses from domain A, then encounters several (20 or so seems to be the threshold) "dead" member addresses from domain A that generate a bounce and then does not even attempt to reach the remaining 800 member adresses from domain A and only sends to members on domain B and domain C.
Is there a way to globaly ignore bounces and send out mails to all members of a list, no matter what?
Thanks, Julian
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