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Hi there,

In the last weeks I have encountered a really strange problem when deleting lots of messages in Apple Mail.

Server specs:
Mac OS Sierra 10.12.1, x86_64
Kerio Connect: 9.2.1 (2397)

Client specs:
Mac OS Sierra 10.12.1
Apple Mail 10.1 (3251)

My sent messages box still contained a lot of messages from 2015 (and a bit from 2014), so I decided to delete the bulk of it (1.995 messages).
First deletion: sent messages to trash
Second deletion: delete from trash

When permanently deleting from Apple Mail's trashcan, the activity window says something like 'moving messages', this seemingly takes an endless amount of time, but ok. When I decided to check the Kerio Admin console, my mailbox grew from 4.1 GB (before deleting anything) to 33 GB in a little over one hour of time.

I stopped Kerio Connect on the server, rebooted the server, but even after that, the mailbox continued to grow. I eventually ended up salvaging as much e-mails as possible and I just deleted my entire account.

This is the second time this has happened (a couple of weeks earlier it was the mailbox of a colleague). His mailbox grew from 4 GB up to 135 GB. He didn't tell my about his mail problems until the end of the day so it had lot's of time to somehow 'grow'.

Can anyone tell me more about this strange issue? My colleagues that use Outlook do not have this problem when deleting bulk messages, so it seems it's an Apple Mail thing.
Brian Reichow

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I have observed the same thing recently. Kerio Connect 9.2.0 running on Mac OS X 10.10.5, with clients using on El Capitan or Sierra.

When end users delete large numbers of messages, the process will often screw up and the Deleted Items folder will grow to an insane size. We've resorted to telling them to do all mass deletions through webmail.

We have always told people not to delete more than 2000 messages at once, and to wait for all activity to complete before deleting another batch, but that guideline isn't enough any more. What's causing this to happen?

[Updated on: Mon, 20 February 2017 16:09]


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Good to see, this isn't a local server problem. I hope someone from Kerio can respond to this issue.

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We have the same problem for ages.
Running the Kerio Server and Mailstore on a SSD seems to increase the number of mails we can delete without having this issue. But It could just be my imagination.
How ever to move or delete large folders we still use the webmail.

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I have and currently am experiencing this same issue again. I've had it a few times over the last year or so. I'm using OS 10.13, Sierra on a MacBook (early 2015). I have had the issue before the computer was updated and I find that if I delete more than 100 messages they come back.

If I archive emails this is what starts the problem off and our mail server just runs out of room and stops the whole companies emails.

It stops my other devices/computers from being able to read the mails and download new mail. If I quit mail on my MacBook I can then use the other devices to download new mail as usual.

I have in the region of 60,000 emails from past 4 years, this is why I need to archive some. My iMac begins the process of downloading all of them again which takes a few hours but then it is usable. My phone does the same but when opening Mail on my MacBook is says 'Downloading Messages in the bottom left' ad then gets stuck with Mail saying 'Moving Messages X of 453' in the bottom left window of Mail. Even when it gets to the point where is says 'Moving Messages 453 of 453' it goes no further.

When you quit and open Mail it will download some of the new messages, when clicking on the new messages nothing comes up in the main body of the message just the 'Loading' symbol which continually spins.


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We have had the same issue.
We had to stop the server and delete the trash folder from the server in the affected users mailboxes.

One user went up to nearly 1TB of usage! Dropped to 33GB in the end.
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