[Mailman-Developers] Re: Mailman, postfix and docker

[Danil Smirnov]

Hey,

As promised a while ago, I've prepared Kubernetes PoC for Mailman 3 (Helm
chart) which is currently deployed into GCP (GKE Autopilot) and exposed at
http://test.mailman4.com/postorius/lists/

The setup is based on Abhilash's container images
 (up to version 0.3.11 - see
below why). Outbound delivery is relayed via Mailgun (due to the outbound
port 25 is blocked in GCP), while income emails received by the local
Postfix container.

When tried previously,

...I've faced only two disappointing issues: 1) HK whitelisting mechanism
> which makes no sense in a dynamic Kubernetes environment and 2) a shared
> volume, which is needed for Core and Postfix to communicate.


The first issue has been resolved by allowing Django's any host notation
 (thank you
folks!), and the second one I've resolved by myself with help of a sidecar
container built from the following code:
https://github.com/danil-smirnov/mailman-postfix-extender

This solution moves Postfix configuration from file-based to network-based
without touching a line of Mailman code. (Of course, it's PoC still and
would look much better if it's part of the Mailman 3 codebase, covered by
tests, etc.)

There are a couple of other issues that I've worked around but have to
address to move to a production-grade solution:

   1. Hardcoded hostnames issue (
   https://github.com/maxking/docker-mailman/issues/449)
   Worked around by adding some redundant code
   

   .
   2. lmtp_host parameter issue (
   https://gitlab.com/mailman/mailman/-/issues/852)
   Worked around by using IP addresses in postfix_lmtp file (possible up to
   0.3.11 version of docker images only - due to recent change
   

   ).

The code could be found in this repository:
https://github.com/danil-smirnov/mailman-helm-chart

I'm glad I've finally shared this, I hope it'll help to improve Mailman 3
compatibility with the modern orchestration tools.

With my best regards,
Danil Smirnov
Mailman3.com


On Sun, Dec 20, 2020 at 1:51 PM Stephen J. Turnbull <
turnbull.stephen...@u.tsukuba.ac.jp> wrote:

> Danil Smirnov writes:
>
>  > Sorry for the confusion - I should write "would allow" instead of
> "allows"
>  > as using socketmap_table would be a great feature but it obviously
> requires
>  > a new endpoint in Mailman core which does not exist yet.
>
> Ah, OK, so what exists now is the Postfix docker (which you provided a
> reference).
>
>  > Otherwise everything looks fine and with those two issues
>  > resolved/mitigated there is no problem to deploy Mailman 3 in
> Kubernetes, I
>  > can prepare an example Helm chart for it.
>
> That would be great!
>
> Steve
>
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[Mailman-Developers] Allow to post in developers list

[Stephen J. Turnbull]

Ankit Punia writes:

 > I want to contribute to mailman. So I request you to allow me to post in
 > developers list so I can communicate with other contributors and
 > understand to product better.

Welcome Ankit!

Just so you know, you're already welcome to post.  We do impose
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If you haven't already joined the list, you can do so here:

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Steve
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[Mailman-Developers] Allow to post in developers list

[Ankit Punia]

I want to contribute to mailman. So I request you to allow me to post in
developers list so I can communicate with other contributors and
understand to product better.
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