Please include a way to completely disable the anti-spam; it's useless to me and has already caused me serious trouble. I've tried every possible way to disable it, but it's been impossible.
Regardless, this sounds like a support request or a fault, which we can't handle here in "ideas". Please post your issue at https://support.mozilla.org/en-US/questions/new/thunderbird with full details please with both exactly the settings you have worked with and what you see. Thanks.