Hi Ralf:

In message <20231119105314.pkrr3v6drdyjyt5x@runtux.com>,
Ralf Schlatterbeck writes:
>On Sun, Nov 19, 2023 at 05:35:37AM +0000, John Rouillard wrote:
>How about using an IMAP port external to the container for retrieving
>mail? That can either be in its own container or be the mailserver of
>the organisation, or a cloud, ...

Yup, using imap or pop are some of the options I mention at:

  https://roundup-tracker.org/docs/installation.html#docker-support

But how do you trigger the call to roundup-mailgw? Some service has to
be running to schedule/trigger roundup-mailgw. Running cron as root
inside the container is problematic as is running cron as non-root.

You can use cron on the docker host (assuming it's not just a
dedicated docker/kubernetes host environment) to run:

   docker exec roundup-tracker roundup-mailgw tracker \
         imaps  ...

periodically, but...

Neither of those runs roundup-mailgw in response to an arriving email
event.

So I thought why not run an smtp frontend that drives the
roundup-mailgw on email arrival. The docker container hosting the smtp
server (really receiver) acts similar to a kubernetes sidecar.