This script helps you manage Exim4 mail server configuration.

exim4-menu.sh

#!/bin/bash
set -euo pipefail

# ── Colors ──────────────────────────────────────────────
readonly RED="\e[31m"
readonly GREEN="\e[32m"
readonly YELLOW="\e[33m"
readonly BLUE="\e[34m"
readonly CYAN="\e[36m"
readonly MAGENTA="\e[35m"
readonly BOLD="\e[1m"
readonly DIM="\e[2m"
readonly RESET="\e[0m"

# ── Config paths ────────────────────────────────────────
readonly CONF_FILE="/etc/exim4/update-exim4.conf.conf"
readonly MACRO_FILE="/etc/exim4/exim4.conf.localmacros"
readonly LOG_FILE="/var/log/exim4/mainlog"
readonly SCRIPT_NAME="Exim4 Manager"
readonly VERSION="2.1"

# ── UI Helpers ─────────────────────────────────────────
print_header() {
    clear
    echo -e "${BOLD}${BLUE}╔════════════════════════════════════════════════════════╗${RESET}"
    echo -e "${BOLD}${BLUE}║                 ${SCRIPT_NAME} v${VERSION}                      ║${RESET}"
    echo -e "${BOLD}${BLUE}╚════════════════════════════════════════════════════════╝${RESET}"
    echo
}

print_separator() {
    echo -e "${DIM}${BLUE}────────────────────────────────────────────────────────${RESET}"
}

pause_for_input() {
    echo -e "\n${DIM}Press Enter to continue...${RESET}"
    read -r
}

log_action() {
    echo "[$(date '+%F %T')] $1" >> /tmp/exim4_manager.log 2>/dev/null || true
}

# ── Validation ─────────────────────────────────────────
validate_root() {
    if [[ $EUID -ne 0 ]] && ! sudo -n true 2>/dev/null; then
        echo -e "${RED}❌ Needs root privileges${RESET}"
        exit 1
    fi
}
validate_exim() {
    command -v exim4 >/dev/null 2>&1 || {
        echo -e "${RED}❌ Exim4 not installed${RESET}"
        echo -e "${YELLOW}💡 Install: sudo apt install exim4${RESET}"
        return 1
    }
}
validate_port() {
    local p="$1"
    [[ "$p" =~ ^[0-9]+$ ]] || { echo -e "${RED}❌ Not numeric${RESET}"; return 1; }
    (( p >= 1 && p <= 65535 )) || { echo -e "${RED}❌ Out of range${RESET}"; return 1; }
    if ss -tulpn 2>/dev/null | grep -q ":$p " && ! ss -tulpn 2>/dev/null | grep -q "exim4.*:$p "; then
        echo -e "${RED}❌ Port $p in use by another service${RESET}"; return 1
    fi
}

# ── Core Features ─────────────────────────────────────
get_exim_ports() {
    ss -tulpn 2>/dev/null | awk '/exim4/ {print $5}' | awk -F: '{print $NF}' | sort -n | uniq
}

check_status() {
    print_header
    echo -e "${BOLD}${CYAN}📊 Exim4 Status${RESET}"
    print_separator

    if ! validate_exim; then pause_for_input; return; fi
    if systemctl is-active --quiet exim4; then
        echo -e "${GREEN}✅ Running${RESET}"
    else
        echo -e "${RED}❌ Not running${RESET}"
    fi

    local ports
    ports=$(get_exim_ports)
    if [[ -n "$ports" ]]; then
        echo -e "\n${BLUE}📡 Listening on:${RESET} ${YELLOW}$ports${RESET}"
    else
        echo -e "\n${RED}❌ No listening ports${RESET}"
    fi

    log_action "Checked status"
    pause_for_input
}

check_ports() {
    print_header
    echo -e "${BOLD}${CYAN}🔌 Listening Ports${RESET}"
    print_separator

    local ports
    ports=$(get_exim_ports)
    if [[ -z "$ports" ]]; then
        echo -e "${RED}❌ No ports${RESET}"; pause_for_input; return
    fi

    for p in $ports; do
        echo -e "${BLUE}  📡 Port ${BOLD}$p${RESET}"
        case "$p" in
            25) echo -e "    ${DIM}SMTP (25)${RESET}" ;;
            587) echo -e "    ${DIM}Submission (587)${RESET}" ;;
            465) echo -e "    ${DIM}SMTPS (465)${RESET}" ;;
            *) echo -e "    ${DIM}Custom${RESET}" ;;
        esac
    done
    log_action "Checked ports"
    pause_for_input
}

change_port() {
    print_header
    echo -e "${BOLD}${CYAN}🔧 Change Listening Port${RESET}"
    print_separator

    local new_port
    while true; do
        read -rp "Enter new port (or q to quit): " new_port
        [[ "$new_port" =~ ^[Qq]$ ]] && return
        if validate_port "$new_port"; then break; fi
    done

    echo -e "${YELLOW}⚠️ Restart required, confirm change to ${BOLD}$new_port${RESET}"
    read -rp "Continue? (y/N): " confirm
    [[ "$confirm" =~ ^[Yy]$ ]] || return

    local backup="/tmp/exim4_backup_$(date +%s).conf"
    [[ -f "$CONF_FILE" ]] && sudo cp "$CONF_FILE" "$backup" && echo -e "${DIM}Backup: $backup${RESET}"

    if grep -q "^dc_local_interfaces" "$CONF_FILE" 2>/dev/null; then
        sudo sed -i "s|^dc_local_interfaces=.*|dc_local_interfaces='0.0.0.0:$new_port'|" "$CONF_FILE"
    else
        echo "MAIN_LOCAL_INTERFACES = 0.0.0.0:$new_port" | sudo tee "$MACRO_FILE" >/dev/null
    fi

    sudo update-exim4.conf
    sudo systemctl restart exim4 && echo -e "${GREEN}✅ Restarted on port $new_port${RESET}" \
        || echo -e "${RED}❌ Restart failed${RESET}"

    log_action "Changed port to $new_port"
    pause_for_input
}

# ── Menu ──────────────────────────────────────────────
main_menu() {
    while true; do
        print_header
        echo -e "1) 📊 Status"
        echo -e "2) 🔌 Ports"
        echo -e "3) 🔧 Change Port"
        echo -e "4) 🚪 Exit"
        echo
        read -rp "Choose [1-4]: " c
        case "$c" in
            1) check_status ;;
            2) check_ports ;;
            3) change_port ;;
            4) clear; echo -e "${GREEN}Bye 👋${RESET}"; exit ;;
            *) echo -e "${RED}❌ Invalid${RESET}"; sleep 1 ;;
        esac
    done
}

# ── Entry ─────────────────────────────────────────────
trap 'echo -e "\n${YELLOW}⚠️ Interrupted${RESET}"; exit 130' INT
validate_root
main_menu