Automated SMTP server configuration?

[acdha]

It seems like an odd gap that the SMTP settings can be configured through the admin area but not using the config file or environmental variables. Did I miss something or is there a deeper reason why that isn't offered? In my hosting environment (AWS ECS) it would be easy to have each of those pulled from the platform secrets store so we wouldn't have to have humans in the loop for tasks like password rotation.