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Home » GFI User Forums » Kerio Connect » Maximum mailbox sizes and what to do about very large item counts
Maximum mailbox sizes and what to do about very large item counts [message #126402] Mon, 14 December 2015 17:22 Go to previous message
DataSmith is currently offline  DataSmith
Messages: 8
Registered: March 2013
I have some Kerio Connect servers in which users (typically on IMAP) store a great deal of mail - in their inbox, sent mail, and in folders.
My question today has to do with the best way to bring the folder sizes down to reasonable level.

A search of this forum shows that Vicki and Neil (in the UK) believe that the maximum message count for any one folder should not exceed 10,000

Vladimir (in the Czech Republic) says (in an email directly to me) something a bit different and explicitly states the following - in the interest of increasing reliability and performance:

"Maximum number of messages in whole mailbox should not exceed 20.000, including all subfolders
No subfolders in Inbox or Sent items, move them to the root level
Maximum number of messages in Inbox or Sent items should not exceed 5.000
Check number of Calendar events, hundreds are fine, thousands are not
Moving/Deletion of messages only in batches of max 200 messages"

My real world experience shows that problems occur as the item count gets into the 50,000 item range.
I do not doubt the wisdom of Vladimir's suggestions, though.
He is particularly concerned about the inbox and sent items folders and they are constantly synced with the mail client.

Whatever the real limits are, I have MANY users well above 5,000 or even 10,000 items in both inbox and sent items.
What can be done about this?

The conventional wisdom tells us that users need to either delete email or create separate folders and manually move excessive mail using the Kerio Connect Client.
Apple mail is singled out a product to AVOID to do mass movements of email.

My users often say it would take them many, many hours to move or delete so much mail so they simply refuse.
There has to be a better way!

In really bad cases, I know it IS possible to log into a user's account and create empty folders, then

1) stop Kerio Connect
2) manually move the mail in the relevant #msgs folder, the
3) start Kerio Connect

I'm not fond of this solution since I have to bring down the mail server - but it does work - if done carefully.

Does anyone have any better ideas?
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