Re: A different problem
- You might check the filter you have.
Thunderbird's spam filtering is heuristic in nature -- it learns from what you tell it is spam. It also unlearns by telling it something is not spam.
I don't know of a way to query it to determine the why.
Setting an address in your address book will disable checking when that address is the incoming address.
Not sure if that is any help but it is a start.