---
title: Reference
description: Email Service reference material including headers, postmaster info, FAQ, and troubleshooting.
image: https://developers.cloudflare.com/dev-products-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/email-service/llms.txt  
> Use this file to discover all available pages before exploring further. 

[Skip to content](#%5Ftop) 

# Reference

Reference material for Email Service, including postmaster information, email headers, troubleshooting, and FAQ.

* [ Postmaster ](https://developers.cloudflare.com/email-service/reference/postmaster/)
* [ Email headers ](https://developers.cloudflare.com/email-service/reference/headers/)
* [ Troubleshooting ](https://developers.cloudflare.com/email-service/reference/troubleshooting/)
* [ FAQ ](https://developers.cloudflare.com/email-service/reference/faq/)

```json
{"@context":"https://schema.org","@type":"WebPage","@id":"https://developers.cloudflare.com/email-service/reference/#page","headline":"Reference · Cloudflare Email Service docs","description":"Email Service reference material including headers, postmaster info, FAQ, and troubleshooting.","url":"https://developers.cloudflare.com/email-service/reference/","inLanguage":"en","image":"https://developers.cloudflare.com/dev-products-preview.png","dateModified":"2026-06-09","publisher":{"@type":"Organization","name":"Cloudflare","url":"https://www.cloudflare.com/"},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}}
{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/directory/","name":"Directory"}},{"@type":"ListItem","position":2,"item":{"@id":"/email-service/","name":"Email Service"}},{"@type":"ListItem","position":3,"item":{"@id":"/email-service/reference/","name":"Reference"}}]}
```