This article describes how to get the full message headers in the most popular email clients. For more information, please take a look at Understanding Email Headers.
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In an open email message, click the File tab.
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On the Info tab, click Properties.
Header information appears in the Internet headers box.
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Open an email message.
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On the Message tab, in the Options group, click the Dialog Box Launcher
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In the Message Options dialog box, the headers appear in the Internet headers box.
Mac Mail
1. Open an email message.
2. Select View>Message>All Headers.
Mac Mail (Older Versions)
1. Open an email message.
2. Select Mail>Preferences, click Viewing, then select “Show additional message headers.”
Mac Mail (Older Versions)
1. Open an email message.
2. Select View>Message>Raw Source
Mozilla Thunderbird
1. Open an email message in the reading pane, in a new tab or in a new window.
2. Navigate to the menu, and select View>Headers>All
Webmail
1. Open an email message
2. Click Toggle Raw Message Headers.