New Script: Proxmox Mail Gateway (#1906)

* Proxmox Mail Gateway LXC

* improvements

* renamed to long name and added install check

* Update proxmox-mail-gateway.sh

* Update proxmox-mail-gateway.sh

* Update proxmox-mail-gateway.json

* Update proxmox-mail-gateway-install.sh

* Update proxmox-mail-gateway.sh

* Update proxmox-mail-gateway.sh

* Update proxmox-mail-gateway-install.sh

---------

Co-authored-by: Michel Roegl-Brunner <73236783+michelroegl-brunner@users.noreply.github.com>

install/proxmox-mail-gateway-install.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2021-2025 community-scripts ORG
+# Author: thost96 (thost96)
+# License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
+
+source /dev/stdin <<<"$FUNCTIONS_FILE_PATH"
+color
+verb_ip6
+catch_errors
+setting_up_container
+network_check
+update_os
+
+msg_info "Installing Dependencies"
+$STD apt-get -y install \
+  curl \
+  sudo \
+  mc \
+  wget
+msg_ok "Installed Dependencies"
+
+msg_info "Installing Proxmox Mail Gateway"
+wget -q https://enterprise.proxmox.com/debian/proxmox-release-bookworm.gpg -O /etc/apt/trusted.gpg.d/proxmox-release-bookworm.gpg
+echo "deb http://download.proxmox.com/debian/pmg bookworm pmg-no-subscription" > /etc/apt/sources.list.d/pmg.list
+$STD apt-get update 
+$STD apt-get -y install proxmox-mailgateway-container
+msg_ok "Installed Proxmox Mail Gateway"
+
+motd_ssh
+customize
+
+msg_info "Cleaning up"
+$STD apt-get -y autoremove
+$STD apt-get -y autoclean
+msg_ok "Cleaned"