some issus with kolab4

[Josef Vogl]

Hi @all,

I hope someone can answer my questions. I have been using Kolab since 
Kolab 3 in recent years. Now, I would like to switch to Kolab 4, as it 
is the future. Currently, I use Kolab behind a mail server. This means 
that Kolab receives emails from some providers (Mittwald, Hetzner, GMX, 
and Web.de) via fetchmail. In the future, I would also like to add some 
Gmail and Outlook.com accounts. All emails are sent via their own 
providers. I use sender_dependent_relayhosts with Postfix for this.

I would now like to recreate this with Kolab 4.
To do so, I installed a VM with Debian 12 on my Proxmox server and 
connected the VM to the internet via an Opnsense firewall (another VM).
After some issues, Kolab4 is now running stably on a single K3s node (as 
my company grows, I will add at least two more nodes to increase 
availability).

To add fetchmail, I had to add another deployment set/pod with a 
fetchmail image and a persistent volume for my fetchmailrc. 
Additionally, fetchmail must send emails to another mail server (Postfix 
Pod?), not localhost.

Sender_dependent_relayhost should also work, as I will add my own 
transport_maps, similar to what I am doing now. I have to add it to the 
Postfix Pod.

Another Problem i found, was that Kolab4 dosn't share Mailfolders with 
serval Domains.
Let me a little explane: I'm using Domain-a.org for all my 
User-Accounts. So my users have to login as user at domain-a.org. But they 
have some shared Mailboxes like info at domain-b.org, info at domain-c.com  
and so on. And the shared Mailboxes are not shown in Roundcube as they 
are loged-in as user at domain-a.org. ( Access for the Folder is 
granted/added ).
Only if a add a Useraccount with user at domain-b.org, then this user can 
see the shared mailbox info at domain-b.org.
Is there any way to get this work in Kolab4, because it works fine in 
Kolab16 witch i'm using at the moment.

And last but not least:
I also have a Nextcloud-Storage @hetzner. It would be great, if i could 
add this as a Storage to Roundcube.
For this, i found https://github.com/nicofrand/Roundav , a fork of 
Rounddrive but both not working.
I also found a solution for adding some webdav-accounts with chwala and 
kolabfiles. I tested it in Kolab16 and it works but it was slow.

So, my questions are:

Are I'm on the right way with fetchmail & sender_dependent_relayhosts or 
are there better solutions?

How did I get Access to shared folders across domains?

and how can I get access to my Nextcloud-Server for my attachments & 
Documents?

Thanks a lot for your replys

Josef
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