Tickets :: Comment on [#11983] limit synced mailboxes by user preferences

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Comment	>>> I have a fairly large mailbox structure, plus access to various >>> shared folders. When I synchronize with a remote device, I therefore >>> generate tons of traffic and load, especially on the "small" remote >>> device. >> >> Currently, it sends all "subscribed" folders in the FOLDERSYNC >> request. The rationale is that if you have subscribed to the folder, >> you are interested enough in it to want to see it on the device. > > When on the road, I usually only need to see if I have new mail and > optionally reply to it. Some other folders will be required, too, > like "Sent" and "Trash". > >> Note that sending the folder via FOLDERSYNC does not necessarily mean >> it pushes that folder, just that it is available on the device for >> viewing. On most of the clients I test, the email is lazy loaded into >> folders other than the INBOX - it only polls the server when you view >> the folder. Some devices will THEN push to that folder for some time >> after it is loaded. Other clients have settings that allow you to >> pick and choose the folders you want pushed vs just available. > > It's my observation too that only messages in the INBOX are actually > pushed to the remote device. But with about 1083 folders (number > increasing), already processing the list of available folders causes > a significant slow-down on my remote... > >>> On the other hand, my remote device won't let me access >>> folders not under my INBOX at all, and I definitely don't need all >>> the sub-folders as available through the web interface. >> >> Curious as to what client this is. I've never seen a client limit >> folders to those only under INBOX. > > It's the default client on WebOS 2.x (HP Pre3). > >>> As I have been unsuccessful to create a second IMAP user with access >>> to the same INBOX, but only few of the folders below, I have created >>> a patch to ActiveSync that allows a user to (currently) select >>> - only to sync folders below and including the INBOX >>> - limit the nesting level of the folders synced >> >> This of course will only work for IMAP servers that are >> structured/configured in this way. My server does not place folders >> under INBOX at all. I have a few hundred mailboxes (of course not all >> subscribed) and most are at the same level as the INBOX. > > Yes, I had anticipated that situation - being able to select which > folders to sync, similar to selecting which calendars and address > books to sync, would cover that. > >>> The according preferences are settable via the standard preferences >>> dialog, per user. >>> >>> A future enhancement may be to explicitly select folders to >>> include/exclude during email sync. >> >> I'd rather not go that route. I feel that this is a client >> responsibility. Also, filtering the folders that are returned via >> FOLDERSYNC responses could screw up search results > > I fully agree to that position, and as I mentioned above, even I > would have preferred to go a different route... a sufficient solution > would have been if I could have used IMAP subscriptions and a second > account - that would have been a favorable solution. But > unfortunately I couldn't get that to work, probably to my > insufficient knowledge of the details of the Cyrus IMAP server. > > That's when I thought that a client-side subscription model, > implemented on the ActiveSync part (rather than the final mobile > client) ought to help... and the long time it seems to take to > process the results of a folder sync, I decided to code a filter > option for that call. But of course, there may be (and your reply > says there are) side effects I couldn't foresee. > > Do you see a different, better place to implement such a filter? I'd > be willing to give this another try. > > BTW: After running this filter on my server/account, processing time > and data transfer volume have already decreased. But I see many > instances of supposedly "filtered" folders in the ActiveSync debug > log, there still is much work left to actually reduce the handling to > only those folders I actually want to see on the remote :/
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