Hi Armin, apologies on my slow response. It's not a stupid question, if you're having issues, it's good for us to be aware of and I really appreciate your feedback.

I've run through both the Mail relay config and the Let's Encrypt DNS setup and both "just worked" for me. I started creating a step-by-step walk through to demonstrate but juggling my other responsibilities has meant that it's taking longer to complete that I had hoped. So I figured should just reply to you now (and I'll complete the walk through ASAP and put it in the docs).

And actually, it's occurred to me that I'm not sure what TurnKey version you are running (currently the appliances are a mix of v17.x & v18.x - we're still working through the v18.x upgrades - hopefully we can get them all updated soon).

So just to confirm, which appliance are you using and which version? Hopefully it's one of the v18.x ones (we've made some significant improvements in v18.x).

Regarding your experience with the Confconsole Mail Relay plugin, I can confirm that your experience (i.e .config gone when you go back in) is "expected". If the test succeeds, then it should be configured correctly (it tests access to the SMTP relay using the credentials that you included). However, looking at it, I can see how you got a bit confused and thought that it didn't work properly as it does not show your config. FWIW it should be only cosmetic, but I've opened an issue regarding that. I agree that having it display the config you added (rather than being blank) it would be completely clear that it worked. It would also make adjustments easier (especially if the test fails). Bottom line your config should be fine, but I will look at improving it at some point (soon hopefully).

Regarding the Let's Encrypt - DNS01 Confconsole plugin, it'd be good to know whether you are running v18.0 or not and which appliance. That is because there was a pretty serious bug in it in the early v18.0 releases. It has since been fixed, but if you have the broken version, you'll need to update confconsole to get that version (once we've finished getting all pass to v18.0, we'll probably look at a v18.1 update for those).

So please double check which version you've got and whether there is a newer version available. I.e. first run 'apt update', then 'apt policy confconsole'. If you are on v18.0 and have the latest version, then it should return this:

confconsole:
  Installed: 2.1.3
  Candidate: 2.1.3
  Version table:
 *** 2.1.3 999
        999 http://archive.turnkeylinux.org/debian bookworm/main amd64 Packages
        100 /var/lib/dpkg/status

If you are on v18.0 and the "Installed" version isn't '2.1.3', then please update it.

I'll try to get the walkthrough done, but I really want to keep the momentum going with the v18.0 updates so we can get those finalized ASAP.