# Page Not Found

The URL `modelling/resiliency/error-channel-and-dead-letter` does not exist.

You might be looking for one of these pages:
- [Error Channel](https://docs.ecotone.tech/modelling/recovering-tracing-and-monitoring/resiliency/error-channel-and-dead-letter.md)
- [Dbal Dead Letter](https://docs.ecotone.tech/modelling/recovering-tracing-and-monitoring/resiliency/error-channel-and-dead-letter/dbal-dead-letter.md)
- [Handling Failures](https://docs.ecotone.tech/modelling/business-workflows/handling-failures.md)
- [Recovering, Tracing and Monitoring](https://docs.ecotone.tech/modelling/recovering-tracing-and-monitoring.md)
- [Message Publisher](https://docs.ecotone.tech/modelling/microservices-php/message-publisher.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://docs.ecotone.tech/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://docs.ecotone.tech/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/modelling/recovering-tracing-and-monitoring/resiliency/error-channel-and-dead-letter.md`)
- Use `Accept: text/markdown` header for content negotiation