# Page Not Found

The URL `print-and-mail/building-a-mail-strategy/mailing-class-and-postage/certified-mail-or-registered-mail` does not exist.

You might be looking for one of these pages:
- [Certified Mail or Registered Mail](https://help.lob.com/print-and-mail/building-a-mail-strategy/mailing-classes-and-postage/certified-mail-or-registered-mail.md)
- [Mailing Classes & Postage](https://help.lob.com/print-and-mail/building-a-mail-strategy/mailing-classes-and-postage.md)
- [Declaring mail use type](https://help.lob.com/print-and-mail/building-a-mail-strategy/managing-mail-settings/declaring-mail-use-type.md)
- [One-time campaigns or triggered sends?](https://help.lob.com/print-and-mail/building-a-mail-strategy/one-time-campaigns-or-triggered-sends.md)
- [Using metadata](https://help.lob.com/print-and-mail/building-a-mail-strategy/managing-mail-settings/using-metadata.md)

## How to find the correct page

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

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/print-and-mail/building-a-mail-strategy/mailing-classes-and-postage/certified-mail-or-registered-mail.md`)
- Use `Accept: text/markdown` header for content negotiation