{
    "storage": {
        "backend": "local",
        "s3": {
            "endpoint": "https://s3.amazonaws.com",
            "bucket": "my-mailova-bucket",
            "region": "auto",
            "access_key": "AKIA...",
            "secret_key": "...",
            "public_url": "https://cdn.example.com/mailova"
        }
    }
}