I have two xeams installations with matching configurations (as far as possible: same users, same domains, same server config)

One is linux ubuntu server 20.04, the other is windows server 2012 based. Both are running in firewall mode against the same exchange server.

One user has associations defined. When I send an email to an associated address, on the windows server thie recipient is not changed and the mail arrives in exchange with original recipient.

The same procedure over the linux machine, there xeams cahnges the recipient address to the basic address of the user, it arrives in exchange with the userId as recipient, making it impossible to recognize which is the original recipient.

How can I change this behaviour on the linux machine to make it the same as on the windows installation?

regards

Michael