> That's a filesystem problem. I figured as much.
> The users do have distinct home directories (from passwd) separated from the mail location? Yeah, in this case /home/mark is the home folder. If necessary I can remove the mail_location directive and test using the users home dir and see if that fails (also on ZFS but in the root storage pool). > is it possible that two Dovecot instances > try to access the same storage ? Or is > there some hardening (SELinux/ > AppArmor) in action? The dovecot mail system is running on OpenSolaris (OpenIndiana to be precise) and uses Solaris's Service Management (smf) to stop and start. I am relatively sure SMF won't let 2 instances run at once. > Or are there some special ACLs in ZFS that > prevent that rename() operation on file > system level? Does the user mark has the > permission at all? Not certain. I don't think so and I certainly didn't enable anything along those lines but this is my first deployment on Solaris so I'm a little out of my depth. I'm used to Debian Linux. -- Mark