[Dovecot] no bookeeping using public folders

[Claude Frantz]

Timo Sirainen wrote:

>> The problem, while using Thunderbird: The "read only" user can delete 
>> messages or mark then read. But after a new session, all the messages 
>> are still "new". Of course, only "baratin" is the owner.

> So you'd want all users to be able to have their own private flags?

The "Seen" flag as private is sufficient here.

> If
> you create dovecot-shared file, the seen flag will be private, but
> others will still be shared. This is currently hard coded, but it's
> pretty easy to change from sources if you really want to:

[....]

Many thanks, Timo, for this interesting information. But, as stated 
above, the "Seen" flag is sufficient and this is the default.

The strange behaviour seems to be probably related to Thunderbird. When 
opening the connection to the public shared folder, Thunderbird shows 
the number of ALL messages in the folder, in the window in which one the 
folders related to the accounts are displayed. Usually only the number 
of unread messages is displayed here. In the window showing the subject, 
sender, etc... of the messages, only the unread messages are displayed 
when using the options "View, Threads, Unread". Therefore, Thunderbird 
knowns about what has been read. But I ignore if Thunderbird is using an 
own bookkeeping or if this information comes from the server.

In the related "dovecot-keywords" file, there is only one line which 
contains "0 unknown-0". This seems strange to me.

Please explain me, where the "private seen flag" is located. I think, it 
cannot be in "dovecot-uidlist" because the second entry in every line is 
the filename in the folder where the message file is located, and the 
"only reading" user is not the owner of this file. Are I'm right ?

I think, I have to investigate further.

Many thanks again,
Claude