Implementation Blueprint

# Update and install PostgreSQL
sudo apt update
sudo apt install postgresql postgresql-contrib nginx -y

# Switch to postgres user
sudo -u postgres psql

# Create DB and user
CREATE DATABASE listmonk;
CREATE USER listmonkuser WITH PASSWORD 'super_secure_password';
GRANT ALL PRIVILEGES ON DATABASE listmonk TO listmonkuser;
\q

# Download and install via curl
mkdir ~/listmonk && cd ~/listmonk
wget https://github.com/knadh/listmonk/releases/download/v3.0.0/listmonk_3.0.0_linux_amd64.tar.gz
tar -zxvf listmonk_3.0.0_linux_amd64.tar.gz

# Make it executable
chmod +x listmonk

./listmonk --new-config

[app]
address = "127.0.0.1:9000"
# Keep this secure
admin_username = "admin"
admin_password = "super_secure_admin_password"

[db]
host = "localhost"
port = 5432
user = "listmonkuser"
password = "super_secure_password"
database = "listmonk"

./listmonk --install

[Unit]
Description=listmonk newsletter manager
After=network.target postgresql.service

[Service]
Type=simple
User=root
# Adjust this path to where your binary and config.toml reside
WorkingDirectory=/root/listmonk
ExecStart=/root/listmonk/listmonk
Restart=always

[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload
sudo systemctl enable listmonk
sudo systemctl start listmonk

server {
    listen 80;
    server_name notify.mycompany.com;

    location / {
        proxy_pass http://127.0.0.1:9000;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

sudo ln -s /etc/nginx/sites-available/listmonk /etc/nginx/sites-enabled/
sudo systemctl reload nginx

// Example Node.js subscriber insertion
const axios = require('axios');

axios.post('https://notify.mycompany.com/api/subscribers', {
    email: "newuser@example.com",
    name: "John Doe",
    status: "enabled",
    lists: [1], // ID of your main newsletter list
    attribs: {
        source: "signup_form",
        tier: "free"
    }
}, {
    auth: { username: 'admin', password: 'super_secure_admin_password' }
});