How can I stop Thunderbird moving my emails to deleted or local folders without instruction
I open my inbox and just have time to see a new email before it disappears and is moved into "deleted". Sometimes an email is moved into a local folder without prior instruction.
Alla svar (1)
Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled".
If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.
Also, check your Message Filters .