Postmark Webhooks
CommunicationsPostmark sends webhooks for delivery confirmations, opens, clicks, bounces, and spam complaints for transactional email. Known for high deliverability rates.
Webhook Events
6 event types
DeliveryEmail was delivered
OpenEmail was opened
ClickLink clicked
BounceEmail bounced (hard or soft)
SpamComplaintSpam complaint received
SubscriptionChangeUnsubscribe or resubscribe
Signature Verification
X-Postmark-SignatureBasic auth on the webhook URL
Sample Payload
Delivery
{
"RecordType": "Delivery",
"ServerID": 12345,
"MessageID": "abc-123-def",
"Recipient": "[email protected]",
"Tag": "welcome-email",
"DeliveredAt": "2026-04-11T10:00:00Z",
"Details": "smtp;250 OK"
}Send a Sample Postmark Payload
Pick an event, enter your endpoint URL (or localhost), and fire a realistic Postmark payload with one click — no Postmark account needed.
Test Sender
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Capture & Inspect Postmark Webhooks Live
Get a free public HTTPS endpoint below, point Postmark at it, and watch events arrive in real time. Use the forwarding rule to relay them straight to your local server.
See it work in real time
Click below to get a live webhook URL instantly. Paste it anywhere — Stripe, GitHub, Postman — and watch events arrive right here.
Expires in 1 hour · No account needed
Forward Postmark webhooks to localhost
- Click Create live endpoint above to get a public HTTPS URL
- Paste the URL into Postmark's webhook settings
- In the Forwarding tab, add a rule: target =
http://localhost:3000/webhooks/postmark - Fire a test event from Postmark — it arrives in the inspector and hits your local handler simultaneously
Ready to test your Postmark webhook handler?
Free HTTPS endpoint with forwarding, retry, and event replay. No install, no CLI, no deploy.
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