September 2021 - Mailman-users - lists.mailman3.org

"this held message has been lost"
by Ethan Furman June 10, 2025

June 10, 2025

I have now seen this message on two different occasions. Any ideas on what is happening? Happy to provide additional information if I am told what is needed (and how to get it -- I'm a web moderator for the list without access to the machine it runs on). :) -- ~Ethan~

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Find a smtp server to send out emails
by Leon March 12, 2025

March 12, 2025

Hi, This problem is not caused by mailman, but I still want to give it a shot here. I'm hosting a mailing list on top of mailman3. Emails are supposed to be sent out by AWS ses. However, ses requires that sender address must be verified, which leads to a problem that emails sent by subscribers to mailing list cannot be sent to other subcirbers, since their addresses are not verified. And it is impossible to verified every subscriber. Are there smtp service providers allowing unverified email address to send out emails, or do I have other solutions? Thanks. -- Best wishes, Leon

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Moderation of held emails vs. spam
by David Krantz March 11, 2025

March 11, 2025

Hi, I now run Mailman 3.3.1, installed from pip. Is there now any way to prevent Mailman from forwarding the contents of the held message when notifying moderators of held messages? In my case these messages often are spam messages and if the entire contents are forwarded it triggers spam handling in the recipient address(es) which over time risks classifying all moderation emails as spam or even classifying the list domain or server as a spam source. Even my own outgoing filter classifies it as spam, which I will fix. I currently run rspamd for spam filtering, graylisting and DKIM and ARC verification/signing. Someone on this recommended it, thank you for that as it removes the need for other milters. I guess that this would be a simple change to make as a kludge but a proper implementation as a setting would be a lot better. I'd like it as a global setting but that might be too coarse. Cheers // David

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How To Install Mailman 3 on Debian 10 (Complete Guide)
by Brian Carpenter Feb. 25, 2025

Feb. 25, 2025

I have finished my how-to install Mailman 3 on Debian 10 completed to the point where you can use it to get a fully functional Mailman 3 environment up and running. This is a comprehensive guide that walks you through installing EVERYTHING (currently!) that Mailman 3 needs to run. It also makes updating Mailman 3/Postorius/Hyperkitty very easy. I have not added the update directions yet but will very soon. I also plan on adding a section on setting up DKIM and Xapian with Mailman 3. I hope this helps those who wish to get a Mailman 3 server up and running quickly and brings a sense of sanity to the confusion regarding the various documentation out there concerning the installation of Mailman 3/Postorius/Hyperkitty. I intend to add a How-to for Ubuntu 20 at some point. Without further ado: https://wiki.list.org/DOC/Howto_Install_Mailman3_On_Debian10 I am sure the above guide can use improvements. Feel free to contact me off-list to point out mistakes/improvements, etc. -- Brian Carpenter Harmonylists.com Emwd.com

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Re: mail stuck in "out" queue
by Dmitry Makovey Dec. 18, 2024

Dec. 18, 2024

So our mailman got stuck again, but I did follow your advise. Here's what I've found: On 3/29/19 2:58 PM, Mark Sapiro wrote: > On 3/29/19 2:28 PM, Dmitry Makovey wrote: >> I've had encountered this situation now twice: mail is being stuck in >> "out" queue and nothing in the logs indicates the issue. Is there a way >> to ask mailman-core politely to attempt delivery (perhaps with increased >> debugging in the logs) *without* restarting the core (which does solve >> *this* problem but creates other problems, like availability of the >> mailman as a whole) > > > Is the "out" runner running? yes: # docker top mailman-core | grep -F out: 100 21681 13215 0 Mar28 ? 01:14:16 /usr/local/bin/python /usr/local/bin/runner --runner=out:0:1 -C /etc/mailman.cfg > ps -fwwA |grep runner=out > > If not, you should be able to start it as the Mailman user with a > command like > > /path/to/python3 /path/to/mailman/bin/runner -C /path/to/mailman.cfg > --runner=out:0:1 > > See 'ps -fwwA|grep runner' for examples > > If the out runner is running, is there a file named *.bak along with all > the *.pck files in queue/out/ there is one, yes: # ls -l /srv/mail/mailman/core/var/queue/out/*.bak -rw-rw---- 1 100 65533 21512 Apr 14 19:45 /srv/mail/mailman/core/var/queue/out/1555296331.8386078+2c905825b82708e5a682b872b0aff320c9dd0b2e.bak what does it indicate and what should my steps be to resolve this (other than restarting queues)? > And if it's not, is there anything in Mailman's logs to indicate why it > died? > > Also, 'mailman restart' should only take a matter of seconds, but if the > out runner is running but not processing its queue, I think sending it a > SIGINT should restart it. SIGINT killed the process allright, but it didn't auto-respawn. I ended up spawning it with: /usr/local/bin/python /usr/local/bin/runner --runner=out:0:1 -C /etc/mailman.cfg but soon realized it doesn't go to background nicely so I've nohup'ed it in the end. but it did solve my problem. -- Sr System and DevOps Engineer SoM IRT

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How to Increase outgoing mail volume for Mailman 3
by Brian Carpenter Dec. 9, 2024

Dec. 9, 2024

Hello everyone, We had a new client come on board that brought a list that had the largest out-going mail volume that I have ever dealt with. So I did what any sane server administrator would do that is running Mailman 3: I ran to Mark Sapiro for help! Here is what the Sage of all things Mailman counseled me to do: 1. Disabled VERP delivery. VERP can help improve mail delivery by delivering 1 message per SMTP transaction (I think I got that right). Using VERP is counter-productive as it can seriously delay outgoing mail delivery for a high-volume list. So you can use something like the following in the MTA section of your mailman.cfg: [mta] verp_confirmations: no verp_personalized_deliveries: no verp_delivery_interval: 0 2. I configured Mailman 3 to run 4 outgoing runners. The default is 1. This action was the game changer. It allows Mailman to handle 4 incoming messages at a time instead of 1. My client's incoming list volume was high enough where it was overwhelming the single outgoing runner. Here is what I added to the mailman.cfg file: [runner.out] instances: 4 Doing this step immediately solved the backlog in var/queue/out. 3. If you start up with a new server for a list that is high volume then keep an eye out for Proofpoint and Vade Security as they will block your new IP address quicker than Mark Sapiro can say "This is a bug. See <some Gitlab.com url>" Mark, thank you! -- Brian Carpenter Harmonylists.com Emwd.com

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Logging subscribes/unsubscribes
by Brian Carpenter Oct. 22, 2024

Oct. 22, 2024

Does Mailman 3 log subscribes and unsubscribes for each list the way Mailman 2 did? Brian

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Questions regarding message acceptance
by Pawel Grzywaczewski Sept. 19, 2024

Sept. 19, 2024

Hello, I have few questions regarding usage of Mailman3: 1) We have list1 and list2 with members. Can we specify that all members of list1 can post messages to list2? We could potentially write a script that would synchronize members of another list to “Accept these non-members” of another list, but with thousands of lists it will be difficult to maintain lists in synchro. So perhaps there is a concept of adding another list to “Accept these non-members” and mailman real-time evaluate membership of another list upon message arrival? 2) In explanation of “Accept these non-members” it’s written: “While non-regexp addresses can be entered here, it is preferred to add the address as a nonmember and set the nonmember's Moderation to Default Processing”. I noticed that if someone posts to a list then he is added automatically to non-members. Which means that next time he will be able to post. My understanding is that it’s better to use the feature “Accept these non-members”. Am I correct? Thank you, Paweł

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Display the last post time for a list or all lists.
by Henrik Rasmussen Aug. 9, 2024

Aug. 9, 2024

Does Mailman 3 have something similar to https://www.msapiro.net/scripts/last_post.py displaying the last post time for a list or all lists?

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MM3 generates long lines?
by peter＠chubb.wattle.id.au July 28, 2024

July 28, 2024

I'm seeing emails being dropped when mm3 talks to the local smtp server, with log errors like: 2021-06-23 15:42:24 1lvvea-007r8u-VN H=localhost (<FQDN>) [::1] F=<announce-bounces@<FQDN>> rejected after DATA: maximum allowed line length is 998 octets, got 1036 The email itself did not have such long lines AFAICT. I can disable line length checking on the mailserver, but that sounds like a recipe for the next one along to drop the email. Peter C

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