How to View Full Source of Email Messages in Outlook

Show headers and discover the source of your incoming email

Outlook accepts messages it receives from the Internet and stores the headers and individual parts of the message regardless of the message body. When you select a message, Outlook collects the fragments to show you exactly what you want. Except when you want Outlook to display headers. By default, Outlook removes certain headers. Here’s how to set Outlook to keep the full source of email messages.

The instructions in this article apply to Outlook 2019, Outlook 2016, Outlook 2013, Outlook 2010, and Outlook for Office 365.

Make the entire message source available in Outlook

To set Outlook to get the original source of messages as they were received at any time:

1. Open the Registry Editor. Go to the field Windows Search enter regedit and press Enter † Or right click the button Start in Windows select walk enter regedit and select Okay †

   

2. Navigate to the Windows registry folder for your version of Microsoft Outlook:

   Outlook 2019 and 2016:

    HKEY_CURRENT_USER  Software  Microsoft  Office  16.0  Outlook  Options  Mail. 

   Outlook 2013:

    HKEY_CURRENT_USER  Software  Microsoft  Office  15.0  Outlook  Options  почта 

   Outlook 2010:

    HKEY_CURRENT_USER  Software  Microsoft  Office  14.0  Outlook  Options  почта 

   Outlook 2007:

    HKEY_CURRENT_USER  Software  Microsoft  Office  12.0  Outlook  Options  почта 

   Outlook 2003:

    HKEY_CURRENT_USER  Software  Microsoft  Office  11.0  Outlook  Options  почта 

   

3. Go to the tab Change select New and then select DWORD or QWORD †

   • Select DWORD (32-bit) value if you have a 32-bit version of Office.

   • Select QWORD (64-bit) value if you have a 64-bit version of Office.

   

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4. Type . to name a value SaveAllMIMENNotJustHeaders and press Enter †

   

5. Double tap the value SaveAllMIMENNotJustHeaders †

   

6. In a text box Data Values enter a and press Okay †

   

7. Close the Registry Editor.

8. Open Outlook. If Outlook is open, close and reopen it.

Outlook stores the message source and message content. This means that future emails will take up more space. Because PST files (where Outlook stores email) have a size limit, you regularly delete or archive email in Outlook.

See full source of message

To get the source of newly received POP messages (edit the value) SaveAllMIMENNotJustHeaders does not restore the full message source for emails already in Outlook):

1. Open the desired message in a separate window.

2. Go to the tab File and select Information †

3. Select Properties †

   

4. To find the source of the letter, see the section Internet headlines †

   

5. Select close to when you’re done.