How to relay E-Mails to "mydestination" for users with no local Mailbox

Hello,

In my environment there are two mailservers. The first
(server1) is running 
exim and is pointed by all MX-Records, the second one
(server2) is running 
kolab/postfix and receives mails only from local clients and
server1. It is 
configured to use server1 as a smarthost.
Both servers handle emails for mydomain.com. Some mailboxes
are located at 
server 1, some on server 2.
My problem occurs when user1mydomain.com tries to send
a mail to 
user2mydomain.com over server2 (the mailbox of user1 is
located at 
server1):
Postfix on server2 says "Mailbox unknown".

How do I have to configure postfix on server2 to send all
mails through the 
smarthost server1 even if the domain is mydestination if a
local 
kolab-account does not exist?

Regards,
Martin Klewitz 

_______________________________________________
Kolab-users mailing list
Kolab-userskolab.org
https:
//kolab.org/mailman/listinfo/kolab-users