On 10/12/16 11:51 AM, Konstantin Khomoutov wrote:
On Wed, 12 Oct 2016 10:59:33 -0500
Bryan Holloway <br...@shout.net> wrote:

New server:
* Debian GNU/Linux 8.6
* Dovecot 2.2.13
* Maildir++
* Quotas enabled

Basically what's happening is that users are seeing large delays when
navigating between different IMAP folders. So, for example, user "X"
is sitting idle in their INBOX. If they then click on another folder
there's a good 6-7 second delay before you can view its contents. If
you immediately then navigate to other folders, you get a rapid
response. But if the client then goes idle again for 10+ seconds, you
will get this delay again. Some are reporting the OS saying "Outlook
is not responding." (Everyone is running Windows 7.)
Any help, suggestions, or pointers would be greatly appreciated.

Do you see

  imap(username) Disconnected for inactivity in=X out=Y

in the logs?

From your description, it appears as if outlook gets disconnected at
some point, and that's why fast changing of the folders works OK (the
connection is live) and doing this after a pause forces a reconnect
with the following relogin.

Just a shot in the dark but still...

I do see quite a few of those, but I tend to see those for many clients across the board.

That does make a lot of sense though. I'm looking at the logs right now, and I see what amounts to a login, followed by a disconnect 10-15 seconds later.

I thought that a standard IMAP connection stays open for at least 30 minutes based on the RFC. (?)

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