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Hi, I saw that each month IMAP service will down once time.
Detail:
-When I telnet to 143 port of server, I must wait a long time to get a response.
After a long time, IMAP service auto wake up.
-I tried to read log files of zimbra, but not thing helpful.
-I checked mysql, it run normally
and, SMTP service and POP3 Service still run normallly.
Who can help me in this situation?
Bugzilla
Wiki
Source
IMAP downs each month. 
Linear Mode
