Thanks Nick for your excellent debugging work. I found two long threads related to this issue in the postfix-users mailing list:
http://postfix.1071664.n5.nabble.com/Outgoing-DANE-not-working- tt105397.html#none http://postfix.1071664.n5.nabble.com/PATCH-Glibc-2-31-DNSSEC-and- GCC-10-tt105461.html#none What happens if you add: options trust-ad to your resolv.conf? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1868955 Title: after upgrade to 20.04: posttls cannot connect to private/tlsmgr To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/1868955/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs