You can configure a header and a footer to appear in email messages that are generated from email templates that contain the $EMAIL_HEADER$ and the $EMAIL_FOOTER$ tokens.
Procedure
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From the navigation pane, go to Manage > Customization > Email templates.
The Email templates page appears.
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In the upper right, click Email header and footer configuration.
The Email header and footer configuration page appears.
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Enter text into the Header box and the Footer box.
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Click Save.