- Extended headers are sometimes useful
- How can I view all message headers in Outlook?
- View all message headers in Outlook for Mac
Extended headers are sometimes useful
Most people don’t need to look at the expanded version of email headers. They contain information such as which server received the message and the true origin of the email, which is useful for detecting spam. Viewing headers is useful in some advanced troubleshooting cases.
These instructions apply to Outlook 2016, Outlook 2013, Outlook 2010, and Outlook for Office 365.
How can I view all message headers in Outlook?
Like many other options, the option to show these headings exists in Outlook, but it is a bit hidden.
Double-click on an email message to open it in a separate window.
Select File † Characteristics †
Look in the field Internet headlines headline information.
Copy the header information by pressing . to click ctrl † C and paste it into Notepad or another text editor.
All headlines appear in the section Internet headlines at the bottom of the dialog box that appears.
View all message headers in Outlook for Mac
To view and check all online email headers for a message in Outlook for Mac:
In the message list, right-click the message whose title bar you want to see.
Select Show source in the context menu that appears.
Locate the message headers at the top of the full source text of the message that opens in TextEdit. The first blank line from the top marks the end of the Internet header area.
Close TextEdit when you’re done with the headlines.