On Wed, 12 Oct 2016 10:59:33 -0500 Bryan Holloway <bryan@shout.net> wrote:
[...]
New server:
- Debian GNU/Linux 8.6
- Dovecot 2.2.13
- Maildir++
- Quotas enabled
- LDAP
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...