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UNKNOWN_FEEDBACK_PROVIDER

The bounce webhook path names an unsupported provider

The URL POST /api/v1/email/feedback/{provider}/{key} accepts postmark, ses, mailgun and sendgrid only.

http status
404
credits
Nothing is billed for a failed request.

What it means

Each provider path parses that provider's own webhook format and maps its events to delivered, bounced or complained. Any other name has no parser and is answered with this code.

What to do

Copy the exact webhook URL from the API keys page for your provider. For any other sending service, post normalized outcomes to POST /api/v1/email/feedback with your secret key instead.

Example response 

{
    "success": false,
    "error": {
        "code": "UNKNOWN_FEEDBACK_PROVIDER",
        "message": "Supported providers: postmark, ses, mailgun, sendgrid.",
        "request_id": "req_01m1kgdm4xngzmbmff68g94w0c"
    }
}

Every error carries the request_id also sent in the X-Request-Id header; quote it when writing to support.

Related

markdown version: /docs/errors/UNKNOWN_FEEDBACK_PROVIDER.md