For Email Clients
Outlook Express Message Headers
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Open Outlook.
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From your inbox, locate the message you'd like to view headers for.
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Right-click the message, and select 'Properties.'
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Open the 'Details' tab in the dialogue box.
* The full headers will appear in the dialogue box.
Outlook 2000 Message Headers
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Open Outlook.
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Open the message you'd like to view headers for.
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Click the 'View' menu, and select 'Options...'
* The full headers will appear in a new window.
Mozilla Message Headers
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Open Mozilla.
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Open the message you'd like to view headers for.
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Click the 'View' menu, and select 'Message Source.'
* The full headers will appear in a new window.
For Webmail Clients
Gmail Message Headers
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Log in to your Gmail account.
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Open the message you'd like to view headers for.
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Click 'More options' next to the 'To:' field.
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Click 'Show original.'
* The full headers will appear in a new window.
Hotmail Message Headers
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Log in to your Hotmail account.
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Click 'Options' next to the tabs.
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Click 'Mail Display Settings' under 'Mail Options.'
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Select 'Full' or 'Advanced' under the 'Message Headers' section, and click 'OK.'
* The full headers for all of your messages will now be available. Return to your inbox, and open the message you'd like to view headers for.
Yahoo! Mail Message Headers
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Log in to your Yahoo! Mail account.
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Open the message you'd like to view headers for.
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Click 'Full Headers' at the top of your message.
* The full headers will appear above the message text.