After updating this morning, I've noticed I have several thousand emails that filename starts with an x in the spool folder (all from today), are these special files that don't go through the spool or aren't recognised by the spool (even though they are in the folder)?

e.g.:

Quite a few look like valid emails, so I'm a bit concerned why they are still there!

There's also quite a few .txt files, I assume these are block lists or blacklists or something similar?

e.g.:

Is this declude filtering and then hiding them from me and the spool?

Are these messages actually going out or coming in?

I'm running the latest build 8025.

Any enlightenment appreciated.