Exceeding IMAP-Traffic with Leopard Mail

I'm seeing some weird network traffic on my mailserver over IMAPS. I configured Mail.app to fetch my mail via IMAPS from my cyrus imap server. Since some weeks I get traffic warning from my provider. The traffic exceeding the former values about 2 or 3 times. I tracked this down with ntop on my server and see that there is a lot of IMAPS traffic. About 780 MB within a few ours to my MacBook with Leopard.
So I assume that the new Mail.app is behaving different then Mail.app in Tiger. The exceeding traffic seems to start when I swiched to Leopard.
Can anyone confirm this?

Yes you are right. The reason is simple and quite sad
Let assume you want to send a mail with an attachment of 1 MB size.
First you send the mail via SMTP: upload traffic 1 MB so far. Then your Sent Items folder gets synchronized: another instance of the message is downloaded: 2 MB total.
Then your All mail folder gets synchronised: that includes All mail, hence Sent Items as well: another 1 MB download will be generated.
Summary:
Sending 1 MB invokes the upload of 1 MB and the download of 2 MB.
If you receive an email of 1 MB size: downloading to Inbox (1 MB), downloading to All Mail (1 MB)
Summary:
Receiving 1 MB invokes the download of 2 MB.
The problem is related to two different issues: one with the sending-sent items relationship, the other is the missing unsubscribe option for IMAP (such function only works for Exchange).
Best Regards
Gergő

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Hosting provider goes on to suggest turning off IDLE command. In my experience turning this feature off did not improve the situation. In fact, it created a few.
Question: Is the hosting provider correct in faulting Apple Mail?
Been fielding the question with a number of people. I'm aware of three people who are experiencing similar problems, each using different mail hosts. Tech reps at inmotionhosting.com and nexcess.com point the finger at a Apple Mail, along with an IT specialist in Los Angeles, CA, and a tech support rep at an Apple Store in Arizona who said that Apple and Google mail are aware of and coordinating to resolve the problem.
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Exceeding IMAP-Traffic with Leopard Mail

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