On Tue, 2010-07-20 at 08:42 -0400, Erik Kratzenberg wrote:
I experienced this today with my own IMAP folder, so maybe being able to
offer a more specific order of events will help. Also not sure if I
previously mentioned that this is occasionally happening with IMAP
folders even though it's much more common under POP3.
1) I had just cleaned out my Junk folder.
2) Two messages were received without error.
So basically what POP3 clients usually do, delete everything. Does the
mailbox have the "FOLDER INTERNAL DATA" message at the beginning?
It did not and still doesn't, after having more messages received.
3) I marked the folder as read in Thunderbird.
4) I restarted Thunderbird
5) The next delivery attempt to that mailbox (using dovecot deliver)
failed:
save failed to Junk: Mailbox isn't a valid mbox file
The odd thing is that the delivery *did* succeed because that message is
in there.
Or maybe you just got two of those same messages? :) I don't think it
could have written it after giving this error.
Well, it had the exact same Message ID and also had several deliveries
afterwards that succeeded before I tried to access the mailbox again
with IMAP.
The very first message header is the one that was corrupted
which always seems to be the case. Does "deliver" read/write the entire
mbox file or just append the new message to the end?
deliver first checks that the mbox file is valid by reading and
verifying the From_-line at the beginning of the file. If it's ok, then
it appends to end of file. The corruption most likely happened during
the expunge, not in deliver.
Hmm. See what it logs with attached patch?
I'll get that patch added and let you know. Thanks.
