After more testing, this seems to be a resolver issue in sendmail, since I can specify an IPv6 address directly as a smart host and it works. If it's a config problem, I don't know what that might be, and it doesn't explain the existing install no longer trying to use IPv6 after upgrading to Focal.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894379 Title: No IPv6 outbound from Sendmail starting with 20.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/sendmail/+bug/1894379/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
