I'm still a bit confused why this address: bounce+66273f.99dcd9c-radg=lists.radg.us@stevebrown.us still shows up in the list of nonmembers on the list I administer. The stevebrown.us is my personal domain and steve@stevebrown is the address I use to be a member of the list. I use administrator@radg.us for the owner of the list. radg.us is a small website that tells potential users how to subscribe and members how to use the list (e.g., how to change their settings or get to the archives). Unfortunately, I wasn't careful and spam/scam bots have scraped the addresses for joining, posting, or contacting the owner that I put on the site. I now have that site behind a Cloudflare firewall, but addresses are already accessible to the bad guys. The lists.radg.us domain is the "own domain" alias for the server that hosts the list run by Mailmanlists.net. What I haven't been able to figure out is what combination of events triggers the nonmember list entry. If I delete it, it comes back in a few days or weeks. The workaround is to just leave it in the list of nonmembers, which is effective in that no other instances of that address appear, but annoying to me. Any explanation that might help me understand would be appreciated.