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<p>Finally I was able to resolve the issue. I had to do close
Thunderbird. Delete the misbehaving folders on imap-server
Maildir/Trash. Start Thunderbird, did "Repair" on Trash folder
after that and the files were gone!</p>
<p>There's only one waisted "ghost" folder shown for renew
subscription (grayed out) that does not exist on imap-server. But
it's not shown in my Trash-Folder anymore! So that's a good
success.</p>
<p>I hope deleting folders in future won't make the problem
reappear.</p>
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<pre class="moz-signature" cols="72">Best regards
Gabriel Kaufmann</pre>
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