Comment 6 for bug 1068921

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:16.0) Gecko/20100101 Firefox/16.0
Build ID: 20121010234852

Steps to reproduce:

I have dramatically growing mailfiles for subfolders in an IMAP account
This is happening under 16.0.1 under kubuntu. The server appears to be running dovecot:

openssl s_client -connect myhostxxxx.webpack.hosteurope.de:993
* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE AUTH=PLAIN AUTH=LOGIN] Dovecot ready.

It was also reporting individual mails with larger (2-5MB) attachments as only having a few (20-30) kb, so my guess is something to do with attachments. Running a repair on the folders fixed it (see below)

I am using this account from a server and a laptop. This may have started when I set up the subfolders (on the laptop as I was traveling) and moved mails into those subfolders. There are two thunderbirds accessing the account at the same time, the server and the laptop (both kubuntu with 16.0.1). The size explosion is happening on the server, and not on the laptop.

I ran out of disk space on /home twice before I saw what the cause was... seems to be as described in bug #463359
I also saw the symptoms as mentioned in bug #802217 with those two folder being continually refreshed (Downloading message x/x in folder1).

INITIAL SIZE:
total 41G
...
-rw------- 1 nils nils 13G Oct 20 15:21 2012-09-folder1
-rw-rw-r-- 1 nils nils 60K Oct 20 15:21 2012-09-folder1.msf
-rw------- 1 nils nils 28G Oct 20 15:49 2012-09-folder2
-rw-rw-r-- 1 nils nils 29K Oct 20 15:49 2012-09-folder2.msf

AFTER REPAIRING ONE IMAP FOLDER
total 13524448
...
-rw------- 1 nils nils 13784117540 Oct 20 15:52 2012-09-folder1
-rw-rw-r-- 1 nils nils 62679 Oct 20 15:52 2012-09-folder1.msf
-rw------- 1 nils nils 43021098 Oct 20 15:51 2012-09-folder2
-rw-rw-r-- 1 nils nils 35978 Oct 20 15:52 2012-09-folder2.msf

AFTER REPAIRING THE SECOND IMAP FOLDER
total 74832
-rw------- 1 nils nils 25172143 Oct 20 15:53 2012-09-folder1
-rw-rw-r-- 1 nils nils 60789 Oct 20 15:53 2012-09-folder1.msf
-rw------- 1 nils nils 43021098 Oct 20 15:51 2012-09-folder2
-rw-rw-r-- 1 nils nils 36180 Oct 20 15:53 2012-09-folder2.msf