SendGrid posts batched email event data to your configured webhook URL. Each POST request contains a JSON array of up to 1000 or more event objects. Events include delivery events (processed, dropped, delivered, deferred, bounce) and engagement events (open, click, spam report, unsubscribe, group unsubscribe, group resubscribe).
SendGrid accepted the message and will attempt delivery.
Content-Type: application/json
Dropped
SendGrid dropped the message due to invalid headers, spam content, unsubscribed recipient, bounced address, or quota limits.
Content-Type: application/json
Delivered
SendGrid successfully delivered the message to the receiving mail server.
Content-Type: application/json
Deferred
The receiving server temporarily rejected the message and SendGrid will retry delivery.
Content-Type: application/json
Bounce
The receiving server permanently or temporarily rejected the message.
Content-Type: application/json
Open
The recipient opened the HTML email message.
Content-Type: application/json
Click
The recipient clicked a link within the email message.
Content-Type: application/json
SpamReport
The recipient marked the email as spam.
Content-Type: application/json
Unsubscribe
The recipient unsubscribed from all emails.
Content-Type: application/json
GroupUnsubscribe
The recipient unsubscribed from a specific suppression group.
Content-Type: application/json
GroupResubscribe
The recipient resubscribed to a specific suppression group.
Content-Type: application/json
About AsyncAPI
The AsyncAPI specification describes event-driven APIs the way OpenAPI describes request/response APIs. A channel is the named pipe — a webhook URL, a Kafka topic, a WebSocket route, an MQTT subject — that producers and consumers publish or subscribe to. Each channel carries one or more messages with structured payloads, and an operation declares whether a given party sends or receives on that channel.
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