ListGuard

ListGuard is a web app + API that continuously monitors your email acquisition sources and list hygiene to prevent deliverability-killing issues (spam traps, role accounts, disposable emails, and suspicious signup bursts). Instead of being yet another “email verifier,” it focuses on ongoing risk scoring and source attribution: which form, campaign, partner, or import introduced bad addresses and how fast the risk is rising. You send events (signup, import, bounce, complaint) to the API; ListGuard returns a real-time risk score, recommended action (allow, quarantine, block), and a short explanation you can log. It also provides weekly deliverability risk reports and webhook alerts when thresholds are crossed. Realistically, this won’t replace your ESP’s analytics; it’s a guardrail layer that helps teams avoid catastrophic list quality mistakes before they happen.