Is there a way around this limitation by modifying permissions on the affected files in /var/qmail/control and /var/qmail/users? The setup I run doesn't allow root access to the vpopmail/domains directory, and so I'd like to be able to add domains as vpopmail rather than remounting my NFS vpopmail/domains directory each time I need to add/remove a domain.
Try this -- no guarantees that it will work.
Make the following files group writable and change the group to vchkpw:
I think that covers all of the files that could be modified by the vpopmail programs.