A comment on Hacker News pointed me to the MECSA tool provided by the European Union.

MECSA stands for My Email Communications Security Assessment, and is a tool to assess the security of email communication between providers.

As I run my own email server, I was curious to find out how my setup is scoring. Here are the results, seems like I'm doing a good job :-)

Link to the full report for jaggi.info: https://mecsa.jrc.ec.europa.eu/en/finderRequest/f856486ecaf94dce5e8022c0a97c63b3