dovecot - Nov 2012 - mdbox corruption

Trying to clean up the last of the corruption caused by my own 
stupidity.  I now have two mailboxes for one user that give errors such as:

doveadm(fax at amfes.com): Error: 
zlib.read(/var/mail/amfes.com/fax/mdbox/storage/m.9): gz trailer has 
wrong CRC value at 20065618
doveadm(fax at amfes.com): Error: 
read(/var/mail/amfes.com/fax/mdbox/storage/m.9) failed: Invalid argument 
(uid=238)
doveadm(fax at amfes.com): Error: 
zlib.read(/var/mail/amfes.com/fax/mdbox/storage/m.9): corrupted data at 
20145217
[...]
doveadm(fax at amfes.com): Error: 
read(/var/mail/amfes.com/fax/mdbox/storage/m.20) failed: Invalid 
argument (uid=5155)
doveadm(fax at amfes.com): Error: 
zlib.read(/var/mail/amfes.com/fax/mdbox/storage/m.20): corrupted data at 
24779604
doveadm(fax at amfes.com): Error: Cached message size smaller than expected 
(1259 < 1260)
doveadm(fax at amfes.com): Error: Corrupted index cache file 
/var/mail/amfes.com/fax/mdbox/mailboxes/INBOX/2010/dbox-Mails/dovecot.index.cache:
Broken physical size for mail UID 5158

'doveadm force-resync' does not appear to fix these.  There appear to be
only the two mdbox files affected and I see about 40 errors. I would 
prefer to salvage as much as possible of these.  What options do I 
have?  Do a dsync to another location and take whatever I get?
-- 
Daniel

On 30.11.2012, at 8.03, Daniel L. Miller wrote:
> Trying to clean up the last of the corruption caused by my own stupidity. 
I now have two mailboxes for one user that give errors such as:
> 
> doveadm(fax at amfes.com): Error:
zlib.read(/var/mail/amfes.com/fax/mdbox/storage/m.9): gz trailer has wrong CRC
value at 20065618
> doveadm(fax at amfes.com): Error:
read(/var/mail/amfes.com/fax/mdbox/storage/m.9) failed: Invalid argument
(uid=238)
> doveadm(fax at amfes.com): Error:
zlib.read(/var/mail/amfes.com/fax/mdbox/storage/m.9): corrupted data at 20145217
> [...]
> doveadm(fax at amfes.com): Error:
read(/var/mail/amfes.com/fax/mdbox/storage/m.20) failed: Invalid argument
(uid=5155)
> doveadm(fax at amfes.com): Error:
zlib.read(/var/mail/amfes.com/fax/mdbox/storage/m.20): corrupted data at
24779604
> doveadm(fax at amfes.com): Error: Cached message size smaller than expected
(1259 < 1260)
> doveadm(fax at amfes.com): Error: Corrupted index cache file
/var/mail/amfes.com/fax/mdbox/mailboxes/INBOX/2010/dbox-Mails/dovecot.index.cache:
Broken physical size for mail UID 5158
> 
> 'doveadm force-resync' does not appear to fix these.  There appear
to be only the two mdbox files affected and I see about 40 errors. I would
prefer to salvage as much as possible of these.  What options do I have?  Do a
dsync to another location and take whatever I get?
There are no tools to fix broken compressed mails. I guess if dsync doesn't
stop in the middle that would work. If it does stop, you'd need to figure
out which messages those are (with doveadm dump) and delete them.