Some correspondents have kolab_user at kolab_server instead of From address in their replies
Valentin Laskov
laskov at festa.bg
Tue Dec 7 16:27:13 CET 2021
Also
for your primary domain you have alias domains - have a look at
https://docs.kolab.org/architecture-and-design/ldap.html#multi-domain-deployments
and again - postfix config
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