Postfix will not start with many error messages

Hello,

I have fresh installation of 9.5 and have the problem that postfix will not start.

I get:

Feb 06 12:43:57 server systemd[187188]: postfix.service: Failed at step NAMESPACE spawning /usr/sbin/restorecon: No such file or directory
Feb 06 12:43:57 server systemd[187190]: postfix.service: Failed to set up mount namespacing: /run/systemd/unit-root/dev: No such file or directory
Feb 06 12:43:57 server systemd[187190]: postfix.service: Failed at step NAMESPACE spawning /usr/libexec/postfix/aliasesdb: No such file or directory
Feb 06 12:43:57 server systemd[187192]: postfix.service: Failed to set up mount namespacing: /run/systemd/unit-root/dev: No such file or directory
Feb 06 12:43:57 server systemd[187192]: postfix.service: Failed at step NAMESPACE spawning /usr/libexec/postfix/chroot-update: No such file or directory
Feb 06 12:43:57 server systemd[187193]: postfix.service: Failed to set up mount namespacing: /run/systemd/unit-root/dev: No such file or directory
Feb 06 12:43:57 server systemd[187193]: postfix.service: Failed at step NAMESPACE spawning /usr/sbin/postfix: No such file or directory
Feb 06 12:43:57 server systemd[1]: postfix.service: Control process exited, code=exited, status=226/NAMESPACE
Feb 06 12:43:57 server systemd[1]: postfix.service: Failed with result 'exit-code'.
Feb 06 12:43:57 server systemd[1]: Failed to start Postfix Mail Transport Agent.

What is weird is that /usr/sbin/restorecon actually does exist…
I never saw this before. Any help please?
Thanks!