It was time to check my mail server config and bring it uptodate.
For some time I have not checked my SSL/TLS setup for the mail server.
Recently I found testssl.sh for checking the SSL/TLS versions of services. It is usable for multiple services, but the main purpose for me is to test my mail server setup that it works correctly and uses only non vulnerable ciphers and protocols.
testssl -t smtp localhost:25It shows the use of vulnerable ciphers or SSL/TLS versions that should not be used anymore.