We're recently experiencing a weird error on Thunderbirds' Sent Folder.
1. If we try to read an email from the sent folder by clicking one of the sent email, then the content would appear to be totally blank. (From a 5 minutes old email)
2. But if we have a look at sent emails that are about 1 days old, then Some would be empty, but then some would display the WRONG content. (I.e content from another email from years ago).
We're using a postfix-dovecot mailgateway that fetches email from the ISP server using fetchmail.