Earlier quoted context omitted.
Sure, it's the author's right to choose what to support and what not. But I'd argue that software openly hostile to docker is probably not the best choice as central piece of your docker-compose based emailling setup, if the alternative is a single golang binary designed for use with docker.
> But I'd argue that software openly hostile to docker is probably not the best choice as central piece of your docker-compose based emailling setup What are you referring to? Because Mailu isn't Docker-hostile, quite the opposite: it is distributed as a set of Docker containers. And dspillett didn't mention what was his friend's project about, it could be totally unrelated to email.
Mailu uses postfix at the very bottom of its jenga tower software stack.