The header is the section of the email which details the path the email has taken to reach you.
Instructions for including the header in a forwarded email vary depending on which email handler you use:
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Outlook 2010
Double click on the message to open it
On the Message tab, there is a group of icons under the title Tags.
Click the Dialog Box Launcher button to bring up the Message Options
The headers will appear in the Internet headers box
Right click in the Internet Headers area to display the edit menu
Click on Select all to highlight the information, and then right click again and select Copy
Click on close to return to your message
Click on Forward and a new window will appear
Right Click in the message area at the top of the message and paste the header into the message before forwarding it.
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Outlook 2013
Right click on the message in the mailbox and choose View Source.
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Outlook 2007
Double click on the message to open it
On the Message tab, there is a group of icons under the title Option.
Click the Dialog Box Launcher button to bring up the Message Options
The headers will appear in the Internet headers box
Right click in the Internet Headers area to display the edit menu
Click on Select all to highlight the information, and then right click again and select Copy
Click on close to return to your message
Click on Forward and a new window will appear
Right Click in the message area at the top of the message and paste the header into the message before forwarding it.
Apple Mail
Double click on the message you wish to forward
Select View from the menu bar
Choose Message and Long Headers
Click on the Forward button
Send message as usual
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Outlook Web Access
Open Microsoft Internet Explorer and go to https://exchange.louisville.edu and sign in
Double click on email massage to open in a new window
Click Message Details which has the icon of an envelope and paper
Highlight all of the contents of Internet Mail Headers box
Right click inside the box and copy the highlighted text and click close
Click forward
In the new message pane, right click in the text box and select paste to insert the full headers
Forward the message to the appropriate email address or addresses
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Office365
Go to https://cardmail.louisville.edu and log in to your account
Right Click on the email and click on view message details
Highlight all of the contents of the message details box
Right Click inside the box and copy the highlighted text
Click Close
Click Forward
In the new message pane, right click in the text box and select paste to insert the full headers
Forward the message to the appropriate email address or addresses