I need the HTML code to paste into another email editor
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You can send a copy to yourself, open it with a client that has "View Source" such as Outlook. You can copy and modify the source code. You will probably want to remove the subscription maintenance from the bottom and change the links. Some of it may be subject to copyright restrictions from Constant Contact but of course the content is yours.
Open the email in Outlook. Right click anywhere in the body of the email and a menu pops up. Select Reveal Source from the menu.
Another option: Open the email then select view in browser window. In the browser, select View - Page Source to see the code.