I have an IMAP-Account on ZOHO (which work like a charm until 3 days ago). But since 3 days I have the issue that I can not delete some mails in this account. If I delete them (or marked it as spam, or as read) they turn back in a few seconds as new unread messages. I've already try the following: 1. Start in Troubleshoot mode 2. Close TB, go to Imap-Folder and delete the Trashbin (I've read this hint in a forum, as the trasbin-file may be corrupt). 3. Go to settings of the account settings (right Mouse Button > Settings > General Information > Repair Folder 4. Checked the Developer Console for errors... no errors shown Non of those solved it. So I decide to deep-check what happend and found following: 1. I've deleted an incoming, unread email from November the 7th. Immediately it was shown again as "new Mail" for TODAY 8:00 AM (see attachment: Thunderbird_Inbox) 2. I've looked into my Webmailer and found that the Email is still there (see attachment Webmailer_zoho) I've done the same for another Email: 1. It is shown as unread, and I've deleted it in THunderbird 2. It appears again immediately - but this email appear with the same In-Date: 12.11.24 16:12 3. BUT in my Webmailer it's shown in the trash-bin So something very strange is going on here!! Any Idea how to debug and fix this?