Based on the report against the test tool, unless this issue is validated with the current version of the tool released in May 2017, it's a false positive. It's not clear there's any kind of bug at all.
** Changed in: postfix (Ubuntu) Importance: Critical => Undecided ** Changed in: postfix (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1591706 Title: postfix is vulnerable to "Secure Client-Initiated Renegotiation" DoS according to testssl To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/1591706/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs