- Mail is lost for one or several of mailboxes. Mailbox is empty, or contains mail for recent days only:
# ls -la /var/qmail/mailnames/example.com/john.doe/Maildir/cur/
- Messages regarding possible errors in filesystem appear in
[ 33.720174] FAT-fs (sda1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
The filesystem was corrupted due to improper unmount.
Repair the filesystem using appropriate utility. If this measure does not help to restore lost data, then it will be required to restore it from backup copies.