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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.

Thunderbird

Email with subject 'Look at the headers!' and message about checking email headers.

Outlook

Outlook email showing message about checking headers, sent by Ian Gifford on October 13, 2014.

Yahoo

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