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Direct Downloads for Sysadmins & DevOps · Release v1.3.0

Download nextxch v1.3.0 directly

All official self-contained packages with zero detours, SHA-256 verified and 100% air-gapped ready, plus a minimal docker-compose.yml for instant deployment. Free forever up to 10 mailboxes (including unlimited domains and unlimited email aliases).

Direct Packages (.msi, .deb, .tar.gz, .zip) Minimal docker-compose.yml SHA256SUMS.txt Go to Guided Install (8 Steps) ->
Docker Compose · SQLite WAL (Zero-Config)

Minimal docker-compose.yml

docker-compose.yml

No external database or Redis required: boots in 3 seconds with built-in SQLite WAL storage, Webmail (/mail/), Admin Cockpit (/admin/), and automatic Let's Encrypt ACME.

docker-compose.yml 
services:
  nextxch:
    image: nextxch/server:1.3.0
    container_name: nextxch
    restart: unless-stopped
    ports:
      - "25:25"     # ESMTP Inbound (MX)
      - "465:465"   # SMTPS (Implicit TLS)
      - "587:587"   # Submission (STARTTLS)
      - "993:993"   # IMAPS (IMAP4rev2)
      - "4190:4190" # ManageSieve
      - "80:80"     # HTTP / ACME HTTP-01
      - "443:443"   # HTTPS: /mail/, /admin/, JMAP, DAV, ActiveSync/EWS/MAPI
    volumes:
      - ./nextxch-data:/app/data
$curl -fsSLO https://nextxch.com/downloads/docker-compose.yml && docker compose up -d
One-Line CLI Installer

Terminal One-Liners (Linux, macOS & Windows)

Downloads the matching release artifact, verifies its SHA-256 digest against SHA256SUMS.txt, and configures the service.

bash / powershell 
# Linux (.deb / systemd) & macOS
curl -fsSL https://nextxch.com/install.sh | sudo bash

# Linux (Docker Compose Stack automatisch erzeugen & starten)
curl -fsSL https://nextxch.com/install.sh | sudo bash -s -- --mode docker

# Windows Server 2019 / 2022 / 2025 (PowerShell als Administrator)
irm https://nextxch.com/install.ps1 | iex

# Bestehende Installation ohne Datenverlust auf v1.3.0 aktualisieren
curl -fsSL https://nextxch.com/install.sh | sudo bash -s -- --update

First Login After Startup

Once started, open the Admin Cockpit at https://<server-ip>/admin/ and Webmail at https://<server-ip>/mail/. The generated initial admin password is written to initial-admin-credentials.txt inside the data folder (or via docker logs nextxch).

All Release Artifacts · Version 1.3.0

Direct Package Downloads (No Wrapper Required)

cosign.pub SHA256SUMS.txt SHA256SUMS.txt.sig install.sh install.ps1 run-benchmark.sh /api/releases/latest (JSON)
Operating System & Description Architecture Format Size Direct Download
Windows Server 2019 / 2022 / 2025 Native Windows Service (SCM) without Docker Desktop or NSSM, incl. GUI & unattended setup (/qn) x64 (amd64) .msi Installer ~59 MB nextxch_1.3.0_setup-win-x64.msi .sig
Windows Server (Portable / In-Place Updater) Self-contained binary (Nextxch.Server.exe + nextxch-cli.exe + Webmail PWA + Admin Cockpit) x64 (amd64) .zip Archiv ~73 MB nextxch_1.3.0_win-x64.zip .sig
Linux Debian 12/13 & Ubuntu 22.04/24.04 LTS Configures systemd unit (nextxch.service), system user, /etc/nextxch, and nextxch-cli amd64 (x86_64) .deb Paket ~71 MB nextxch_1.3.0_amd64.deb .sig
Linux Debian & Ubuntu (ARM64 / Raspberry Pi 5) For Hetzner CAX, AWS Graviton, Apple VMs, and Raspberry Pi 5 (64-bit Debian/Ubuntu) arm64 (aarch64) .deb Paket ~68 MB nextxch_1.3.0_arm64.deb .sig
Linux Universal (RHEL, Alma, Rocky, SUSE, Arch) Self-contained release bundle with zero external .NET runtime dependency x64 (amd64) .tar.gz Archiv ~71 MB nextxch_1.3.0_linux-x64.tar.gz .sig
Linux Universal ARM64 Self-contained ARM64 binary incl. Webmail, Admin Cockpit, and nextxch-cli arm64 (aarch64) .tar.gz Archiv ~68 MB nextxch_1.3.0_linux-arm64.tar.gz .sig
macOS (Apple Silicon M1 / M2 / M3 / M4) Native macOS arm64 bundle for Mac mini servers, local development & testing osx-arm64 .tar.gz Archiv ~68 MB nextxch_1.3.0_osx-arm64.tar.gz .sig
Cryptographic Signature Verification (Azure Artifact Signing & Sigstore cosign)
Authenticode: CN=iqmeta GmbH Sigstore cosign + Rekor 
# 1) Docker-Hub-Multi-Arch-Image prüfen (Sigstore cosign + Rekor Transparency Log):
cosign verify --key https://nextxch.com/cosign.pub nextxch/server:1.3.0

# 2) Release-Paket oder SHA256SUMS.txt prüfen (Sigstore cosign-blob):
curl -fsSLO https://nextxch.com/cosign.pub -O https://nextxch.com/downloads/SHA256SUMS.txt -O https://nextxch.com/downloads/SHA256SUMS.txt.sig
cosign verify-blob --insecure-ignore-tlog --key cosign.pub --signature SHA256SUMS.txt.sig SHA256SUMS.txt

# 3) Windows-Authenticode-Signatur prüfen (iqmeta GmbH · Microsoft ID Verified CS AOC CA 04):
Get-AuthenticodeSignature .\nextxch_1.3.0_setup-win-x64.msi | Format-List Status, SignerCertificate, TimeStamperCertificate