msmtp and starttls security

2021-08-26

A recent security analysis of STARTTLS revealed many problems of STARTTLS (as opposed to immediate TLS) in mail clients and servers. The researchers published their fake mail server software that can be used for testing client software such as msmtp.
I used this software to test msmtp and found no problems, but I would be grateful if someone could double check this in case I missed something. Please let me know your results, I will update this news item accordingly!