sendmail is vulnerable to "Secure Client-Initiated Renegotiation" DoS according to testssl

According to testssl sendmail is vulnerable to "Secure Client-Initiated Renegotiation" DoS according to testssl, and there seems to be no obvious way to change this using configuration:

testssl@xl:~$ ./testssl.sh -t smtp 127.0.0.1:25
...
 Secure Client-Initiated Renegotiation VULNERABLE (NOT ok), DoS threat

1) testssl@xl:~$ lsb_release -rd
Description: Ubuntu 14.04.4 LTS
Release: 14.04
testssl@xl:~$ apt-cache policy sendmail
sendmail:
  Installed: 8.14.4-4.1ubuntu1
  Candidate: 8.14.4-4.1ubuntu1
  Version table:
 *** 8.14.4-4.1ubuntu1 0
        500 http://be.archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages
        100 /var/lib/dpkg/status

3) What I expected to happen

Sendmail should either be resilient to this out of the box, or there should be a config option to make it so

4) What happened instead

Sendmail is vulnerable to this condition, without an obvious way to change this using configuration