New IMAP capability for advertising support for shared Seen state (was Re: "Cyrus IMAP4" to "Cyrus IMAP" accidental change of greeting?)

[Alexey Melnikov]

Martin Konold wrote:

>Am Sonntag, 12. April 2009 10:44:03 schrieb Alexey Melnikov:
>
>Hi,
>  
>
>>Bernhard Reiter wrote:
>>    
>>
>>>>following (don't forget that shared seen state is per-mailbox):
>>>>
>>>>Check for ANNOTATEMORE in the CAPABILITIES
>>>>        
>>>>
>>>>GETANNOTATION <mboxname> "/vendor/cmu/cyrus-imapd/sharedseen" "value"
>>>>
>>>>If you get an empty response, then no shared seen state. 
>>>>        
>>>>
>>>question. It is not feasable to try to set the annotation on a  test
>>>folder for each connection IMO. So best would be if there would be a
>>>SHAREDSEEN or so capability.
>>>      
>>>
>>I would support standardizing of such IMAP capability.
>>    
>>
>Technically it would be required to test with every mailbox not only with each 
>connection. E.g. there are sometimes reasons why the shared seen is only 
>available for some namespaces.
>
>IMHO probing each mailbox or each namesapce is not an option and would pervert 
>the efficiency of IMAP especially over high latency low bandwidth links.
>  
>
No, I had something else in mind - return this capability if at least 
one mailbox is known to support shared seen state.
This might benefit other IMAP servers more, e.g. if a server is known to 
only support shared seen state, or always support shared seen state for 
a particular mailbox.

>On the other hand capabilities should not be expanded without good reasons.
>
>What about a server provided GETANNOTATION answer?
>
Regards,
Alexey

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