Real-time delivery events streamed to your backend
Keep your database in sync with live email telemetry. Subscribe to dispatches, opens, clicks, bounces, spam complaints, and unsubscribe events with sub-second delivery.
Event dispatch latency
Cryptographic verification
Exponential backoff retry window
Engineered for developer velocity
Granular event filtering
Subscribe only to the events your application cares about, reducing webhook noise on high-volume accounts.
HMAC cryptographic signing
Every webhook payload carries a timestamped signature header so your server can verify authenticity.
Automatic retry queue
If your endpoint experiences downtime, Mailofly retries delivery with exponential backoff for up to 3 days.
How it works
Configure your endpoint
Enter your server URL and select which event types you want to receive.
Verify the webhook signature
Validate incoming payloads using our official Node.js, Python, or Go SDKs.
Respond with 200 OK
Acknowledge events and trigger downstream user flows, receipts, or analytics syncs.
Explore related features
Real-time deliverability radar
Continuous deliverability telemetry across Gmail, Yahoo, Microsoft 365, and corporate ISPs with early throttling warnings.
Instant bounce diagnostics
Automatic classification of soft vs. hard bounces with precise SMTP reply codes, server error messages, and remediation recommendations.
Auditability & event verification
Immutable message history and cryptographic proofs that confirm exactly when an email was dispatched, accepted, and opened.
Ready to build with Automated webhook events?
Join thousands of engineering teams delivering transactional and lifecycle email with blazing speed and zero downtime.