dovecot - Jan 2006 - dovecot 1.0alpha5 not deleting messages from mbox

Hi,
  I have had some problem with duplicate emails using dovecot1.0alpha5using the
prebuilt testing binaries on a debian stable/testing 3.1system.  I am running
both pop3d and imap, but all users are just usingpop3d.  I am using mbox format.
Users are using Thunderbird 1.5 to access emails.  Dotlocks are used,postfix is
the email agent. Note that dovecot/[postfix are running in avserver.

In debugging the dovecot log, it seems to me that dovecot thinks thatit is
deleting the messages, but actually nothing is happening.

here is a log of a user logging in and what happens after logging out:

dovecot: 2006-01-20 21:41:04 Info: pop3-login:
Login:user=<user2@example.org>, method=PLAIN,
rip=10.8.0.6,lip=192.168.99.5, TLS

dovecot: 2006-01-20 21:41:04 Error: pop3(user2@example.org): mbox sync:Expunged
message reappeared in mailbox /home/vmail/user2@example.org(UID 5668 < 5691,
seq=2, idx_msgs=0)

dovecot: 2006-01-20 21:45:33 Info: pop3(user2@example.org): Logout.top=0/0,
retr=20/ del=20/20, size=29362389

a quick check show that mbox size has not been changed -- none of the20/20 files
have been deleted, even though dovecot states del=20/20 !

Mboxes grow quite large, sometime the problem resolves itself. Interestingly, if
I stop dovecot and restart it, on the next
access to pop3 all of the messages are deleted correctly and the mboxreturns to
the default size.

Any ideas?

Andy


		
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On Tue, 2006-01-24 at 12:32 -0800, Andrew Mendelsohn
wrote:
> dovecot: 2006-01-20 21:41:04 Error: pop3(user2@example.org): mbox
> sync: Expunged message reappeared in
> mailbox /home/vmail/user2@example.org (UID 5668 < 5691, seq=2,
> idx_msgs=0)
Why is this happening? This is the cause of why they're not getting
expunged.

You're not using NFS? Is anything else than Dovecot and Postfix
accessing the mboxes?

There are two possibilities. One is that X-UID header keeps changing in
mboxes, and another is that Dovecot's indexes keep somehow breaking. It
says that idx_msgs=0 there, so it looks like the messages have been
deleted from Dovecot's index, but not from the mbox file.

Or are there other errors in logs, and the above error is only Dovecot's
attempt to fix the problem caused by another crash/something?

That error could happen for example if Dovecot really deletes the mails,
but something else copies the mbox back there :)

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