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How to View Raw SMTP Email Headers in Outlook

I had to do some SMTP relay troubleshooting and it wasn’t obvious how to view the raw SMTP message in Outlook. So here’s how:

In the message window, choose File/Properties and look at the “Internet headers” at the bottom of the Properties dialog.

Microsoft Outlook Properties dialog - Internet headers

I am using Office Professional Plus 2016. If you have a different version of Outlook such as Outlook 2010 or Outlook 2013, the steps may be different for your version.

Chinh Do

I occasionally blog about programming (.NET, Node.js, Java, PowerShell, React, Angular, JavaScript, etc), gadgets, etc. Follow me on Twitter for tips on those same topics. You can also find me on GitHub.

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This Post Has One Comment

  1. As the message headers are a large block of text, Message Header Analyzer ( is useful for displaying it into a categorized table.
    It’s also available as an Outlook plugin, particularly in Office 365. Useful for security review, to see how the message fared in spam filters.

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