I recently hat some issues with one of my accounts. At first some random mails disappeared right after receiving them, which made me question my sanity. Last week, I was able to witness a mail being recieved, appearing in search results, disappearing in the client and disappearing the mail from the server about a minute later. While I was still wondering about this and looking for solutions (I tried the "Repair Folder" last week), I found no apparent changes, until yesterday, when about 9 months worth of emails turned into thin air. (Not in the inbox, not in the trash, not in the archive or on the server). Fortunately our IT department has backups and could also confirm my suspicion that the deletion was issued from Thunderbird. I think there is a severe bug somewhere, but at the current moment I don't have the smallest clues to write a useful bugreport. Where would you start collecting evidence for this? (Running Thunderbird, version=128.6.0, on Windows10, when this happened) Thanks, Daniel