Long story short... my ISP's AI spam filter went crazy on me. They finally fixed the problem. I can send my research notes again, but only through my ISP's web mail. But Thunderbird is still throwing a VO-101 error. How do I reset my spam filter? Thunderbird 115.3.3 (64-bit). Just updated to 115.10.1 (64-bit). The problem persists. Win 10 Pro Also... Feedback: Did a Thunderbird search and automatically clicked the first entry. (Yes... that was stupid.) Ended up at a site that wanted my credit card number. Didn't give them any personal info.