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I have turned OFF all message filter instructions, yet even after restarts, Thunderbird is moving messages to 'Trash'. This has been happening for a week or so.

Ref: Thunderbird 60.3.1 32 bit on my 64 bit Windows 7 Pro, all up to date.

What I do:

Viewing Inbox, I down-arrow to the next message, which 20% of the time is auto-trashed and the subsequent message is revealed.

I do Edit / Undo ( Ctrl-Z should also work) and then Thunderbird retrieves the trashed message.

This is bizarre and a thing I can't explain.

  • Junk mail filtering? – Hannu Nov 27 '18 at 16:41
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When you say you turned off all message filtering, you may not have turned off what's moving your messages.

There are different filters that are controlled in different places:

  • Filters; these are controlled through tools | message filters, and may include both filters provided by Mozilla, like SpamAssassin, and rules you create yourself.
  • Junk Mail Filtering; with general options accessed through Edit | Preferences | Security | Junk.
  • Junk Mail filtering is turned on and off at the account level, accessed through Edit | Account Settings then within each account Junk Settings.

The junk mail filtering is a learning system, but it comes with some rudimentary rules built in as a start, and is turned on by default.

If you verify that all filtering is actually disabled, there are many other things that can cause this kind of symptom. There is a whole Mozilla Knowledge Base article on disappearing mail. Not all of the possibilities listed match your symptoms, but some of the possibilities include:

  • corrupted index files (in your case, that would be a good bet, but there are other possibilities)
  • anti-virus software deleting messages
  • incoming messages sent with incorrect date
  • messages read with a different email client

The solutions depend on the cause, and they're covered in that knowledge base article.

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