Default folder permissions

[dsp3]

I have 2 users experiencing the same issue. They can send messages, but 
they will not be saved to the default folders as defined in roundcube 
(error - can't save). If they create new folders and delegate them for 
'sent' then messages are saved to the new locations. Same with 
calendars, until a new one is created, no new events. They are also 
unable to view the contents of their inboxes. 'kolab list-mailboxes' 
shows that they exist - indeed they can be seen in roundcube.

Creating a new user via Webadmin does not suffer from this behaviour, so 
that leads me to believe that it is related only to these 2 users and is 
permissions related to the default mailstore directories. However, 
comparing these to a good user, shows no differences: "drwx------ 2 
cyrus mail" for sent, for example.
Any help on how to debug this appreciated.
DSP3

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