Setup mail server and restructure some things

config/environments/proxmox-vm/default.nix

@@ -0,0 +1,8 @@
+{ ... }:
+{
+  imports = [
+    ./hardware-configuration.nix
+  ];
+
+  services.qemuGuest.enable = true;
+}

config/environments/proxmox-vm/hardware-configuration.nix

@@ -0,0 +1,45 @@
+{ config, lib, modulesPath, ... }:
+{
+  # hardware-configuration.nix copied and adapted from the default configuration generated by nixos-generators
+
+  imports = [
+    (modulesPath + "/profiles/qemu-guest.nix")
+  ];
+
+  boot = {
+    initrd = {
+      # To use the VirtIO SCSI disks, add the "virtio_scsi" kernel module to availableKernelModules
+      availableKernelModules = [ "uhci_hcd" "ehci_pci" "ahci" "virtio_pci" "virtio_blk" ];
+      kernelModules = [ ];
+    };
+
+    kernelModules = [ "kvm-amd" ];
+    extraModulePackages = [ ];
+
+    # Enable console output on TTY1 and serial console
+    kernelParams = [
+      "console=tty1"
+      "console=ttyS0,115200"
+    ];
+
+    growPartition = true;
+  };
+
+  fileSystems."/" = {
+    device = "/dev/disk/by-label/nixos";
+    fsType = "ext4";
+    autoResize = true;
+  };
+
+  swapDevices = [ ];
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp6s18.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}