Receive DLRs
Overview
You can receive DLR messages via SMTP or HTTP webhook on the same URL as regular messages. The original message is referenced in the message_id
attribute.
DLR status codes
Webhook Format
All requests are made using the POST HTTP Verb to the specified endpoint.
The request will include the following headers:
NOTE: additional headers may be included that are not listed here.
Example payload:
Webhook Response
You must respond with a 2xx status code to acknowledge the DLR message.
If you respond with a 5xx status code the MMS system will retry delivery later with an exponential backoff, similar to MMS delivery.
3xx and 4xx status codes will be considered as a permanent failure and we won't attempt re-delivery
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