docker-images/docker: restructuring

wiki/docker/mailserver_-_docker-mailserver.md

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+# mailserver - docker-mailserver
+
+This is a [Docker](/wiki/docker.md) container for a mailserver.
+The official container and documentation was made by
+[mailserver](https://hub.docker.com/r/mailserver/docker-mailserver).
+It contains dovecot, antispam, antivirus, ssl, etc.
+
+## Set-up
+
+The configuration is done automatically using scripts by mailserver.
+First you need to download the essential setup files.
+
+```sh
+wget -O .env https://raw.githubusercontent.com/docker-mailserver/docker-mailserver/master/compose.env
+wget https://raw.githubusercontent.com/docker-mailserver/docker-mailserver/master/docker-compose.yml
+wget https://raw.githubusercontent.com/docker-mailserver/docker-mailserver/master/mailserver.env
+wget https://raw.githubusercontent.com/docker-mailserver/docker-mailserver/v9.0.1/setup.sh
+chmod a+x ./setup.sh
+```
+
+After that you need to edit the `.env` and the `mailserver.env<>` files to
+configure the mailserver.
+
+Create the file `rebuild.sh`.
+You then need to start the container with the `rebuild.sh` and add email
+accounts using the following command.
+
+`./setup.sh email add <user@domain> (<password>)`
+`./setup.sh alias add postmaster@<domain> <user@domain>`
+
+And finally generate the DCIM keys and rebuild once again.
+
+`./setup.sh config dkim`
+
+Finally if a reverse proxy is used check the
+[traefik entry](/wiki/docker/traefik.md#setup-mailserver) or the
+[nginx entry](./nginx.md).
+
+Afterwards you're ready to go by once again running the `rebuild.sh` file.
+
+## rebuild.sh
+
+```sh
+#!/bin/sh
+docker-compose down
+docker pull mailserver/docker-mailserver:latest
+docker-compose up -d
+```