Real-time delivery events streamed to your backend
Subscribe to supported email lifecycle events and verify the signature before processing incoming notifications.
What is Mailofly Automated Webhook Events?
Mailofly sends HTTPS notifications for supported email lifecycle events. Payloads are signed with HMAC-SHA256 and failed deliveries receive up to five attempts.
SHA256 signature verification
Maximum delivery attempts
Event notifications
Technical Parameters & Standards
X-Mailofly-Signature: t=timestamp,v1=hex-digest
timestamp.rawBody
Up to 5 attempts; retry delays of 1 minute, 5 minutes, 30 minutes, and 2 hours
10 seconds per attempt
Engineered for developer velocity
Email lifecycle events
Subscribe to supported sent, delivered, opened, clicked, bounced, failed, and complained events.
HMAC-SHA256 signatures
Verify the timestamp and raw JSON payload using your webhook secret.
Bounded retries
Failed HTTP deliveries are retried up to five total attempts.
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.
Frequently Asked Questions
Explore related features
Email API & SMTP Relay
Send notifications, receipts, and verification emails through Mailofly's REST API or SMTP relay. Use official SDKs, searchable logs, and signed webhook events to integrate email into your application.
SMTP Relay Service
Connect existing apps and email clients to Mailofly's SMTP relay using an API key. Send from verified domains and inspect recorded delivery status and errors.
Marketing Emails & Broadcasts
Create and schedule marketing campaigns for segmented audiences, use supported template variables, select sender identities, and review campaign analytics.
Ready to build with Automated Webhook Events?
Join thousands of engineering teams delivering transactional and lifecycle email with blazing speed and zero downtime.