---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/sendgrid/ui/sending-email/checking-email-source#article
headline: How do I check the headers/raw source of an email?
description: Learn how to view the raw source and headers of an email in Gmail, Outlook, Thunderbird, and Yahoo to troubleshoot deliverability and message issues.
url: https://www.twilio.com/docs/sendgrid/ui/sending-email/checking-email-source
inLanguage: en
dateModified: 2026-07-21T11:17:13.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# How do I check the headers/raw source of an email?

Being able to check the raw headers of an email can be incredibly useful when troubleshooting. Headers contain all sorts of details about a message's security, composition, and even the journey it takes from point A to point B.

Our Support agents may sometimes ask you to give us the raw source or headers of an email to help them solve email issues. Use the following methods to obtain headers in some popular mail clients.

**Gmail**

![Gmail interface showing email raw headers and details option.](https://docs-resources.prod.twilio.com/f1d9ec74ae4fe2cafadbe4892a48924142452faf330f9c375f3a280e323a7a26.gif)

**Thunderbird**

![Email with subject 'Look at the headers!' and message about checking email headers.](https://docs-resources.prod.twilio.com/bb5d7722d370781ca8785323ea3413a8fbfa6100ec803385c8c6d8c5a074c726.gif)

**Outlook**

![Outlook email showing message about checking headers, sent by Ian Gifford on October 13, 2014.](https://docs-resources.prod.twilio.com/637a3cb7f1f459cb09a8cae863c9a7a51c2da2e271c838b42de39aa581fb073c.gif)

**Yahoo**

Look for the option called "View Raw Message" under the More menu (displayed as 3 dots).