# 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. Below are a few methods for obtaining 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).