On 19.12.2012, at 0.40, Morten Stevens <[email protected]> wrote:

>>> Dec 10 15:21:04 mail dovecot: imap([email protected]): Error: Cached message 
>>> size smaller than expected (5010 < 8192)
>>> Dec 10 15:21:04 mail dovecot: imap([email protected]): Error: Corrupted 
>>> index cache file 
>>> /var/vmail/example.org/user//mdbox/mailboxes/INBOX/Ubuntu/dbox-Mails/dovecot.index.cache:
>>>  Broken physical size for mail UID 27517
>> 
>> Could you try if this fix helps? 
>> http://hg.dovecot.org/dovecot-2.1/rev/bded819417d9
> 
> Thanks for the quick reply, but it doesn't help.

Can you easily reproduce this with a new empty user, using some simple IMAP 
commands? Or alternatively running imaptest tool? http://imapwiki.org/ImapTest

Also send your full doveconf -n output. And especially: are you using zlib 
plugin compression? Storing attachments separately?

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