[Dovecot] One user having reproducible IMAP issues

[Alex Boster]

Dovecot version upgraded to 1.0r26 (did not fix problem).
The server is a CentOS 4 x86 box.
Using ext3 filesystem.
Previous attempts to fix the issue have included simply moving aside  
the user's INBOX to recreating a new account from scratch.  Sometimes  
the email behaves for a while, but within a day is not working  
again.  In Mail.app (the user's usual mail client) the INBOX folder  
simply appears empty.  mutt (run locally on the server) shows the  
messages there correctly.


The problem is easily reproducible.  Move /var/spool/mail/[username]  
to a backup file and remove all .imap directories for that user.   
Mail may work for a while, but will stop within 24 hours.  The  
SquirrelMail message is: ERROR:

The server couldn't find the message you requested.
Most probably your message list was out of date and the message has  
been moved away or deleted (perhaps by another program accessing the  
same mailbox).
Click here to return to INBOX

dovecot -n :

# /etc/dovecot.conf
log_path: /var/log/dovecot.log
info_log_path: /var/log/dovecot.debug.log
login_dir: /var/run/dovecot/login
login_executable(default): /usr/libexec/dovecot/imap-login
login_executable(imap): /usr/libexec/dovecot/imap-login
login_executable(pop3): /usr/libexec/dovecot/pop3-login
mail_location: mbox:~/mail:INBOX=/var/spool/mail/%u
mail_full_filesystem_access: yes
mail_executable(default): /usr/libexec/dovecot/rawlog /usr/libexec/ 
dovecot/imap
mail_executable(imap): /usr/libexec/dovecot/rawlog /usr/libexec/ 
dovecot/imap
mail_executable(pop3): /usr/libexec/dovecot/pop3
mail_plugin_dir(default): /usr/lib/dovecot/imap
mail_plugin_dir(imap): /usr/lib/dovecot/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/pop3
auth default:
   mechanisms: plain login
   passdb:
     driver: pam
     args: dovecot
   userdb:
     driver: passwd

Thanks!
Alex


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