Hello.

First of all sorry for my bad English.

Since yesterday my Courier MTA makes trouble.
I am Using Debian Lenny with this Courier Packages:

courier-authdaemon/stable uptodate 0.61.0-1+lenny1
courier-authlib/stable uptodate 0.61.0-1+lenny1
courier-authlib-mysql/stable uptodate 0.61.0-1+lenny1
courier-authlib-userdb/stable uptodate 0.61.0-1+lenny1
courier-base/stable uptodate 0.60.0-2
courier-imap/stable uptodate 4.4.0-2
courier-imap-ssl/stable uptodate 4.4.0-2
courier-pop/stable uptodate 0.60.0-2
courier-ssl/stable uptodate 0.60.0-2

Courier uses virtual Mailboxes with MySQL.

Now lets begin reporting the failure
Yesterday, my Courier couldn´t open some Mailbox Folders. On my Mailbox only 
the INBOX Folder shows Mails. If I open Trash or Sent with Thunderbird he says 
"Unable to open this Mailbox". My wifes Mailbox doesn´t work. No Folder works 
fine.

After this I have checked Logs and permissions on my Debian Server.

The permissions on my Mailbox looks good:
.Trash# ls -la
total 32
-rw-r--r-- 1 vmail vmail 43 May 6 2009 courierimapacl
drwx------ 2 vmail vmail 4096 Nov 1 15:05 courierimapkeywords
drwx------ 2 vmail vmail 12288 Jan 5 14:15 cur
-rw------- 1 vmail vmail 0 May 6 2009 maildirfolder
drwx------ 2 vmail vmail 4096 May 6 2009 new 

Now I tested my Mailbox with Telnet:
0 select INBOX
* FLAGS ($MDNSent \Draft \Answered \Flagged \Deleted \Seen \Recent)
* OK [PERMANENTFLAGS ($MDNSent \* \Draft \Answered \Flagged \Deleted \Seen)] 
Limited
* 141 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1241624545] Ok
* OK [MYRIGHTS "acdilrsw"] ACL
0 OK [READ-WRITE] Ok
0 select INBOX.Trash
0 NO Unable to open this mailbox.
0 select INBOX.Spam
0 NO Unable to open this mailbox. 

INBOX ok, the others Unable to open this mailbox.
After this I stopped my Courier and deleted courierimapuiddb for Trash. (This 
mails aren´t important)
Nothing happened. Normally Courier should read the folder and write a new 
courierimapuiddb.

In the mail logs I only see this lines:
Jan 5 14:54:30 s1 imapd: LOGIN, [email protected], ip=[::ffff:127.0.0.1], 
port=[47965], protocol=IMAP
Jan 5 14:54:30 s1 imapd: LOGOUT, [email protected], ip=[::ffff:127.0.0.1], 
headers=0, body=0, rcvd=116, sent=611, time=0 

Can anybody help me with my problem. I don´t know what to do?
How can I see more logs from Courier. I have written DEBUG_LOGIN in 
authdaemonrc but this logs only the login. Are there any other options?

Maybe important the value in mysql table is 0. Because in many posts i found on 
google the solution was the Quota. But it works fine for 2 years with this 
setup.

I am leaving with best regards and hope someone can help me with my problems

Jens


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