Comment 155 for bug 883459

(In reply to Hussam Al-Tayeb from comment #136)
>
> <unknown> is the default empty filter which is there before you add yours.
> It doesn't do anything. Since this is likely some sort of race issue with
> filters, it's not going to appear when there are no filters (only the
> <unknown> one).
>
> Maybe junk filtering and virus scans should not be exposed as filters but
> instead some internal plugins (with configuration options) that hook in as
> filters.

To have an empty <unknown> filter without any setting makes no sense to me. I would put an empty list there. But this is just a view.

Worse is that filtering and mail fetcher resources actually have synchronization problems about four years (!) according to the creation time of this report.

I can provide logs or any information I'm able to gather from my system for analyzing. I'm not able to solve this.