When I try to load https://mailman.agoranomic.org/, I see a certificate error:
"Firefox detected an issue and did not continue to mailman.agoranomic.org. The website is either misconfigured or your computer clock is set to the wrong time." Firefox won't even let me override the warning: "mailman.agoranomic.org has a security policy called HTTP Strict Transport Security (HSTS), which means that Firefox can only connect to it securely. You can’t add an exception to visit this site." though Chrome is more flexible. If it's not easy to update the certificate, perhaps HSTS should be disabled since https technically isn't working (and Firefox is taking that seriously)?