Implement email_tunnel service and installation scripts for Proton Bridge integration

uninstall_email_tunnel.sh

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+#!/usr/bin/env bash
+#
+# Uninstallation script for email_tunnel systemd service
+
+set -euo pipefail
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+echo "======================================"
+echo "email_tunnel Service Uninstaller"
+echo "======================================"
+echo ""
+
+# Check if running as root
+if [ "$EUID" -eq 0 ]; then
+    echo -e "${RED}Error: Do not run this script as root or with sudo${NC}"
+    echo "The script will request sudo privileges when needed."
+    exit 1
+fi
+
+SERVICE_NAME="email_tunnel.service"
+
+# Check if systemctl is available
+if ! command -v systemctl &> /dev/null; then
+    echo -e "${RED}Error: systemctl not found${NC}"
+    echo "This script requires systemd."
+    exit 1
+fi
+
+# Check if service is installed
+if ! systemctl list-unit-files | grep -q "$SERVICE_NAME"; then
+    echo -e "${YELLOW}$SERVICE_NAME is not installed${NC}"
+    echo "Nothing to uninstall."
+    exit 0
+fi
+
+# Confirm uninstallation
+echo -e "${YELLOW}This will remove the $SERVICE_NAME systemd service.${NC}"
+echo "Your script and configuration will NOT be deleted."
+echo ""
+read -p "Continue with uninstallation? (y/N) " -n 1 -r
+echo ""
+if [[ ! $REPLY =~ ^[Yy]$ ]]; then
+    echo "Uninstallation cancelled."
+    exit 0
+fi
+echo ""
+
+# Stop the service if running
+echo "Stopping $SERVICE_NAME..."
+if systemctl is-active --quiet "$SERVICE_NAME"; then
+    sudo systemctl stop "$SERVICE_NAME"
+    echo -e "${GREEN}✓ Service stopped${NC}"
+else
+    echo "Service is not running"
+fi
+echo ""
+
+# Disable the service
+echo "Disabling $SERVICE_NAME..."
+if systemctl is-enabled --quiet "$SERVICE_NAME"; then
+    sudo systemctl disable "$SERVICE_NAME"
+    echo -e "${GREEN}✓ Service disabled${NC}"
+else
+    echo "Service was not enabled"
+fi
+echo ""
+
+# Remove service file
+echo "Removing service file..."
+if [ -f /etc/systemd/system/$SERVICE_NAME ]; then
+    sudo rm /etc/systemd/system/$SERVICE_NAME
+    echo -e "${GREEN}✓ Removed $SERVICE_NAME${NC}"
+else
+    echo -e "${YELLOW}No service file found to remove${NC}"
+fi
+echo ""
+
+# Reload systemd
+echo "Reloading systemd daemon..."
+sudo systemctl daemon-reload
+echo -e "${GREEN}✓ Systemd reloaded${NC}"
+echo ""
+
+# Reset failed state if exists
+sudo systemctl reset-failed "$SERVICE_NAME" 2>/dev/null || true
+
+# Verify uninstallation
+echo "Verifying uninstallation..."
+if systemctl list-unit-files | grep -q "email_tunnel"; then
+    echo -e "${RED}Warning: Some email_tunnel units still found${NC}"
+    systemctl list-unit-files | grep email_tunnel
+else
+    echo -e "${GREEN}✓ Service unit removed${NC}"
+fi
+echo ""
+
+echo "======================================"
+echo "Uninstallation Complete!"
+echo "======================================"
+echo ""
+echo -e "${GREEN}The email_tunnel systemd service has been removed.${NC}"
+echo ""
+echo "Your files are still available:"
+echo "  - email_tunnel.py (relay script)"
+echo "  - .env (configuration)"
+echo "  - email_tunnel.service (service template)"
+echo ""
+echo "You can reinstall with: ./install_email_tunnel.sh"