Some loser at a non-profit organization (three-letters followed by dot org) decided to add one of my professional email addresses to their email list. This is called “spam.” They had an opt-out method included in the message. So I followed that process. And got an error message back from their mail server. so I fired off a complaint to the technical contact listed on their web site. Same email address. It still doesn’t work. So I complained to their other technical contact.I’d love to blacklist them form my work mail servers, but I can’t. But I can blacklist them from my personal mail server. Idiots.