How To Check Email Header In Outlook

Examining the full routing path of an email starts with checking the email header in Outlook. If you have ever wondered where an email really came from or why it landed in your spam folder, the header holds all the answers. This guide shows you exactly how to check email header in Outlook across different versions, so you can trace messages, spot phishing attempts, and troubleshoot delivery issues.

Email headers are like the envelope of a digital letter. They contain technical details about the sender, the servers the message passed through, and the time it took to reach you. Most people never look at them, but they are a powerful tool for anyone who wants to stay safe online.

In this article, you will learn step-by-step methods for Outlook on Windows, Mac, web, and mobile. We will also cover how to read the header data, common problems, and a handy FAQ section. Let us get started.

What Is An Email Header And Why Check It

An email header is a block of text that accompanies every message you send or receive. It includes fields like From, To, Date, Subject, and a long list of technical entries such as Received, Message-ID, and Authentication-Results.

Headers are not visible by default. You have to dig a little to see them. But once you do, you can verify the sender’s identity, check if the email was tampered with, and see the exact route it took across the internet.

Common reasons to check headers include:

Identifying phishing or spoofed emails
Understanding why an email went to spam
Tracing delayed or missing messages
Verifying legitimate senders for business communication

Now we get to the core of this guide. Below are the exact steps for each version of Outlook. Follow the instructions for your specific setup.

How To Check Email Header In Outlook For Windows (Desktop App)

Outlook for Windows is the most common version. The process is simple but slightly hidden.

Open Outlook and double-click the email you want to inspect. This opens it in a separate window.
In the new window, click the File tab in the top-left corner.
Click Properties in the menu that appears.
Look for the section labeled Internet headers. The full header text is displayed in a box.
Select all the text (Ctrl+A), copy it (Ctrl+C), and paste it into a text editor or an online header analyzer for easier reading.

That is it. You now have the raw header data. You can also save the email as a .msg file and open it in Notepad to see the header, but the Properties method is faster.

How To Check Email Header In Outlook For Mac

Outlook for Mac has a slightly different interface. Do not worry, the steps are just as easy.

Open the email by double-clicking it.
Click the View menu in the top toolbar.
Select Message and then All Headers. A panel will appear at the bottom of the message window showing the full header.
You can copy the text from there if you need to analyze it further.

Some older versions of Outlook for Mac may have the option under Message > Internet Headers. If you do not see All Headers, check that menu item.

How To Check Email Header In Outlook On The Web (Outlook.com)

Using Outlook in a browser? The process is different but still straightforward.

Log in to Outlook.com and open the email you want to check.
Click the three dots (More actions) next to the Reply button at the top of the message.
Select View message source from the dropdown menu.
A new window or tab will open showing the full email header and body in raw format.
Copy the text and paste it into a header analyzer if needed.

This method works for both free Outlook.com accounts and Microsoft 365 web access. The header includes all the routing information you need.

How To Check Email Header In Outlook Mobile App (IOS And Android)

The mobile app does not have a built-in header viewer, but there is a workaround.

Open the email in the Outlook mobile app.
Tap the three dots in the top-right corner of the message.
Select View message source or View headers (the exact wording varies by version).
The header will appear as plain text. You can copy it and send it to yourself for analysis.

If you do not see the option, try forwarding the email to a desktop client and checking there. Some mobile versions hide the header feature.

How To Read An Email Header In Outlook

Now that you have the header, what do you do with it? The text can look like gibberish at first. But each line has a purpose.

Key Fields In An Email Header

Here are the most important fields to look for:

Received: Shows every server the email passed through. The bottom entry is the first hop, and the top is the last hop before your inbox.
From: The sender’s address as displayed. This can be spoofed, so do not trust it alone.
Reply-To: Where replies will go if different from the From address.
Return-Path: The actual address for bounced emails. Often matches the real sender.
Authentication-Results: Shows SPF, DKIM, and DMARC checks. Pass or fail tells you if the email is legitimate.
Message-ID: A unique identifier for the email. Useful for tracking.
Date: When the email was sent, in UTC format.

How To Spot A Fake Or Phishing Email Using Headers

Phishing emails often have telltale signs in the header. Look for these red flags:

The From address does not match the domain in the Return-Path.
Authentication-Results show FAIL for SPF, DKIM, or DMARC.
The Received path includes unknown or suspicious servers.
The email claims to be from a company but the header shows a different origin.

If you see any of these, do not click links or download attachments. Report the email to your IT team or mark it as phishing.

Common Problems When Checking Email Headers

Sometimes the header option is not where you expect it. Here are a few issues and fixes.

Header Option Missing In Outlook For Windows

If you cannot find the Properties button, make sure you have double-clicked the email to open it in a separate window. The single-pane preview does not show the header option.

Another reason could be that you are using an older version of Outlook. Update to the latest version or use the web app as a backup.

Header Text Too Long Or Hard To Read

Raw headers can be hundreds of lines long. Use an online header analyzer tool. Paste the text, and the tool will highlight the key fields for you. Microsoft has a built-in analyzer, but third-party tools like MXToolbox also work well.

Mobile App Does Not Show Headers

As mentioned, the mobile app is limited. If you need to check a header urgently, forward the email to a desktop client or use the web version on your phone’s browser.

Advanced Tips For Email Header Analysis

Once you are comfortable with basic headers, you can dig deeper.

Tracing Email Delivery Delays

If an email took hours to arrive, the Received timestamps tell the story. Compare the timestamps between hops. A long gap between two servers indicates a delay at that point.

Verifying Email Authenticity For Business

For business emails, always check the Authentication-Results. Legitimate organizations configure SPF, DKIM, and DMARC correctly. If any of these fail, treat the email with caution.

Using Headers For Legal Or Compliance Purposes

Headers can serve as evidence in disputes. Save the full header and the email as a .msg or .eml file. This preserves the metadata for legal review.

Frequently Asked Questions

Can I Check Email Headers In Outlook Without Opening The Email?

No, you must open the email in a separate window or view its source. The header is not visible in the preview pane or message list.

What Is The Difference Between Header And Body In An Email?

The header contains routing and metadata, while the body is the visible content you read. Headers are not displayed by default.

How Do I Check Email Header In Outlook For A Forwarded Message?

When you forward an email, the original header is usually preserved. Check the forwarded message’s header using the same steps. The original header will be inside the forwarded message.

Why Does My Outlook Header Show Multiple Received Lines?

Each Received line represents a server that handled the email. Multiple lines are normal, especially for emails sent across long distances or through security gateways.

Can I Check Email Header In Outlook For A Deleted Email?

If the email is in your Deleted Items folder, you can still open it and check the header. Once permanently deleted, the header is lost unless you have a backup.

Final Thoughts On Checking Email Headers In Outlook

Knowing how to check email header in Outlook gives you control over your inbox. You can verify senders, troubleshoot delivery issues, and protect yourself from phishing. The steps are different for each platform, but the core idea is the same: find the hidden data and read it carefully.

Start with the desktop app if you use Windows, or the web version if you are on a browser. For mobile, use the workaround or switch to a desktop client. Once you have the header, focus on the Received and Authentication-Results fields. Those two areas tell you the most about the email’s journey and legitimacy.

Practice on a few emails you know are safe. Compare headers from friends and from unknown senders. Over time, you will spot anomalies quickly. This skill is valuable for anyone who uses email daily, whether for work or personal communication.

If you run into trouble, remember that online tools can parse the header for you. They highlight the important parts and explain what each field means. Do not be afraid to use them.

Email headers are not just for IT professionals. With a little practice, you can master them too. So next time you get a suspicious message, do not delete it right away. Check the header first. It might save you from a scam or help you understand why your email went missing.