---
title: 4007: Messaging service reported a send failure | API Docs
description: The underlying messaging service rejected or failed the send.
---

The underlying messaging service rejected or failed the send. Delivered asynchronously as a `message.failed` webhook. Unlike a timeout, the service actively reported that this message did not go out. Failures of this class were previously reported under the generic 4001.

## Troubleshooting

- Retry the message; transient service-side failures are common
- Verify the recipient address is valid and reachable
- If failures persist for one recipient, try a different `preferred_service`