On Tue, 2011-06-14 at 11:10 -0700, Daniel L. Miller wrote: > Are "acl_groups" a list of UNIX groups? Or are they defined somewhere > else within Dovecot? ACL groups are only a list of groups that are used by ACL plugin when applying the ACLs from the dovecot-acl files. There's no requirement for them to match UNIX groups. There's no need to list them anywhere.