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
.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.
