Feature Request

This is more or less a follow-up of @OrvilleQ's PR that brought general Podman support.
As OrvilleQ mentioned earlier, another PR should fix this.

Context

Currently the script will complain with the message Curently docker-mailserver doesn't support podman's rootless mode if it is running rootless.

Is your Feature Request related to a Problem?

docker-mailserver cannot be run in rootless mode.

Describe the Solution you'd like

It should be running in rootless mode.

I'm new to podman, so I don't know exactly how a proper solution should look like.
To be honest, I'm not even sure what it needs root for.
As far as I understood, the port within the container image shouldn't matter (since it can be mapped at the host), right?
And on the outside only the CAP_NET_BIND_SERVICE capability should be needed for privileged ports, right?

Are you going to implement it?

No, and I understand that it is highly likely no one will implement it. Furthermore, I understand that this issue will likely become stale and will be closed.

Additional context

Alternatives you've considered

Not using docker-mailserver for projects that require rootless mode, I guess? 🤷

Who will that Feature be useful to?

For people using rootless services as it is commonly suggested.

What have you done already?

Nothing except writing this issue.