[Dovecot] Several errors

[FraNL]

After a
chown root:root /var/mail/vhosts/mydomain.tld/user
chmod 700 /var/mail/vhosts/mydomain.tld/user

I get the following error in my log:

Jul 25 13:32:19 dovecot: Fatal: chdir(/var/mail/vhosts/mydomain.tld/user)
failed: Permission denied (euid=0(root) egid=1000 UNIX perms seem ok, ACL
problem?)