Migrating to Kolab using redirection

[Gerald Brandt]

On 2015-10-17 5:05 PM, Mathias Friman wrote:
> 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 <http://domain.com>.
>
> 2. We therefore create a subdomain kolab.domain.com 
> <http://kolab.domain.com> with a separate MX record
>
> 3. We setup a rule in FirstClass to forward mail to 
> name at kolab.domain.com <mailto:name at kolab.domain.com>
> Kolab <-------------------- FirstClass <--- Internet
> kolab.domain.com <http://kolab.domain.com> <- domain.com 
> <http://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 <mailto: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 <mailto:user at domain.com> -> user at domain.com 
> <mailto:user at domain.com> -> Internet
>
> 7. When all users are migrated, the domain kolab.domain.com 
> <http://kolab.domain.com> can be removed
>
> My plan was to setup the Kolab-server as domain.com 
> <http://domain.com> and then add the kolab.domain.com 
> <http://kolab.domain.com> subdomain. I've tried to do this but got an 
> authentication error for the user at kolab.domain.com 
> <mailto: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
>
Hi,

I'm currently doing this with Exchange Server 2003.  As a user is moved 
to Kolab, exchnage is told to forward their email to mail1.example.com.  
All incoming email goes to Exchange.

When a user sends and email, it is automatically relayed to Exchange.  
If the user being emailed resides on kolab, exchange uses the existing 
forwarding.  Other wise it keeps the mail locally, or sends it out to 
the world as required.

Once the users are all migrated, I'll change the postfix relay rule 
back, and the firewall to send all emails to Kolab.

I've done it for a single user now, and I'll be migrating a couple of 
test users over next week.

Gerald

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