Migrating to Kolab using redirection

[Mathias Friman]

Hi!

In our organization we would like to migrate to Kolab from the ancient
FirstClass. Since we have a large number of users, we would like to move
them a small number at a time. This is the scenario:

1. We would like to forward a select number of mailboxes to the Kolab
server which is created with the domain: domain.com.

2. We therefore create a subdomain kolab.domain.com with a separate MX
record

3. We setup a rule in FirstClass to forward mail to name at kolab.domain.com
Kolab <-------------------- FirstClass <--- Internet
kolab.domain.com <- domain.com

4. The mail is forwarded and put in the users' Kolab mailbox

5. The user responds to the email and get the sender address name at domain.com

6. The mail gets sent via Postfix in a smart host config through the
original server.
Kolab---------------------> FirstClass
user at domain.com -> user at domain.com -> Internet

7. When all users are migrated, the domain kolab.domain.com can be removed

My plan was to setup the Kolab-server as domain.com and then add the
kolab.domain.com subdomain. I've tried to do this but got an authentication
error for the user at kolab.domain.com user.. Is there something else I have
to do than doing what https://docs.kolab.org/howtos/multi-domain.html says?

Kindest regards,
Mathias
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