Is it possible to run this in one (or more) Docker containers? I'd really like to know.

I suppose I could try to write a docker-compose file but my knowledge of Docker, networking, email standards, etc are not up to the task. So I'd feel more comfortable if someone more knowledgeable could pick up this task.

transformRequest only fires if its a method that can have a body. This is misleading, as it's very common to perhaps want to tweak headers or something on an outgoing request before it gets to the destination server.

The solution is "use" instead of "transformRequest", but I was banging my head on this today.