# Page Not Found

The URL `integration/custom-mail` does not exist.

You might be looking for one of these pages:
- [Custom Mail](https://docs.ipaper.io/flipbook-integration/custom-mail.md)
- [Custom Domain](https://docs.ipaper.io/flipbook-integration/custom-domain.md)
- [Query String Parameters](https://docs.ipaper.io/flipbook-integration/query-string-parameters.md)
- [iPaper Embed Script (Pop-ups)](https://docs.ipaper.io/flipbook-integration/ipaper-embed-script.md)
- [Form Integration](https://docs.ipaper.io/flipbook-integration/form-integration.md)

## How to find the correct page

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

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/flipbook-integration/custom-mail.md`)
- Use `Accept: text/markdown` header for content negotiation