[8.940016] Mail Manager "unknown " account

Hi All

I have 3 configured accounts under the pop3 prefetch settings but as I was checking the mail manager today, I've noticed that there is an "unknown" accounted listed as well(attached).

This is not new to v9 beta as I have seen it before to previous versions as well.

Anyone knows more about this?

Thanks

Attached Images

Untitled.jpg (33.4 KB)