Uniqueness of dovecot mailbox-guids

[Christian Binder Stadt Freilassing]

Update: seems to me that the old cyrus mailserver already uses these non-unique mailbox guids.

Is it necessary to have them unique over all private namespaces?
Thanks
Christian
 
----------------ursprüngliche Nachricht-----------------
Von:Christian Binder Stadt Freilassing [christian.binder at freilassing.de  ]
An:"dovecot dovecot.org" [dovecot at dovecot.org  ]
Datum:Thu, 29 Jan 2015 09:24:12 +0100
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> Sorry if this is a duplicate message. I'm new in this mailing list and not sure if 
> the first message really got posted ...
> 
> Dovecot version:2.2.9
> 
> We're using doveadm backup to migrate user mailboxes from cyrus to dovecot. I 
> defined a master user for the old cyrus mailserver in imapc backend to get access 
> to all the mailboxes. Now I realized that after migration every user's "Inbox" or 
> "Trash" on the new dovecot server has the same mailbox-guid, e.g:
> 
> User a:
> inbox dd9456...
> trash 5549cc...
> 
> User b:
> inbox dd9456...
> trash 5549cc...
> 
> Is this a wanted behaviour? If i do not migrate with doveadm backup and just 
> manually create mailboxes, the mailbox-guids are globally unique, e.g:
> 
> User a:
> inbox dd9456...
> trash 5549cc...
> 
> User b:
> inbox c543fe...
> trash t49ccc...
> 
> Thanks!
> Christian
>