Hello,

I have several users with Maildir format. After upgrading from 2.2 to 2.3, some directories could not be opened from thunderbird. The server log shows all kinds of errors including these:

Corrupted record in index cache file /home/user01/Maildir/.Elk&APw-ld&APY-tt/dovecot.index.cache: UID 2802: Broken physical size in mailbox

Cached message size larger than expected (18 > 17, box=Sent, UID=2802)

While trying to fix the problem, I have accidentally deleted some of the index/cache directories. In particular, Maildir/.Sent/.imap and  Maildir/.Sent/cur/.imap folders were deleted, but all of the mail message files are there. When I try to open the "Sent" folder from thunderbird, it does not show all of the messages. It only shows messages until 2019.01.12. If I send out an email from thunderbird, then a new message is copied into the Maildir/.Sent/ folder, but it is not visible from thunderbird. I have already tried to unsubscribe + subscribe to the Sent folder, but it did not work - it re-downloads all messages until 2019.01.12, but not after that.

Can I somehow regenerate the index files, force dovecot to recreated .imap foder, and force thunderbird to re-download and show all of the files somehow?

Thank you,

   Laszlo