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Installation

Binary Installation

Linux

# Download the latest release
wget https://github.com/CaboneMailServer/GoSMTP-dup/releases/latest/download/gosmtp-dup-linux-amd64

# Make executable
chmod +x gosmtp-dup-linux-amd64

# Move to system path (optional)
sudo mv gosmtp-dup-linux-amd64 /usr/local/bin/gosmtp-dup

Windows

1. Download gosmtp-dup-windows-amd64.exe from releases
2. Place in your desired directory
3. Run from command prompt or PowerShell

macOS

# Download for Intel Macs
wget https://github.com/CaboneMailServer/GoSMTP-dup/releases/latest/download/gosmtp-dup-darwin-amd64

# Download for Apple Silicon Macs
wget https://github.com/CaboneMailServer/GoSMTP-dup/releases/latest/download/gosmtp-dup-darwin-arm64

# Make executable
chmod +x gosmtp-dup-darwin-*

# Move to system path (optional)
sudo mv gosmtp-dup-darwin-* /usr/local/bin/gosmtp-dup

Docker Installation

Pull from Registry

# Pull latest image
docker pull ghcr.io/cabonemailserver/gosmtp-dup:latest

# Pull specific version
docker pull ghcr.io/cabonemailserver/gosmtp-dup:v1.0.0

Build from Source

# Clone repository
git clone https://github.com/CaboneMailServer/GoSMTP-dup.git
cd GoSMTP-dup

# Build Docker image
docker build -t gosmtp-dup .

Source Installation

Prerequisites

• Go 1.24 or later

Build from Source

# Clone repository
git clone https://github.com/CaboneMailServer/GoSMTP-dup.git
cd GoSMTP-dup

# Build
go build -o gosmtp-dup .

# Install (optional)
sudo cp gosmtp-dup /usr/local/bin/

Systemd Service (Linux)

Create a systemd service file:

sudo tee /etc/systemd/system/gosmtp-dup.service > /dev/null <<EOF
[Unit]
Description=GoSMTP Duplicator
After=network.target

[Service]
Type=simple
User=nobody
Group=nogroup
ExecStart=/usr/local/bin/gosmtp-dup
Restart=always
RestartSec=5
WorkingDirectory=/etc/smtp-dup

[Install]
WantedBy=multi-user.target
EOF

# Reload systemd and start service
sudo systemctl daemon-reload
sudo systemctl enable gosmtp-dup
sudo systemctl start gosmtp-dup

Verification

Test that the installation works:

# Check version (if available)
./gosmtp-dup --version

# Test with minimal config
echo "smtp:
  listen: \"127.0.0.1:2525\"
  domain: \"localhost\"
relay:
  destination_primary: \"localhost:25\"" > test-config.yaml

./gosmtp-dup

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