You can save any message you compose in the system's Content Library as either a paragraph or a template. Before you send your message, choose Save from the PoliteMail send toolbar. This will open the Save As window.
Choose whether you want to save the message as a template or a paragraph, and then give it a name. If you want the content to be available to all users, select "Share This;" if you want to keep the content for your own use, choose "Keep Private."
Include a description of the content, assign a file category, product/interest, and target title, to help you decide when it would be appropriate to use this content in the future. If the content is part of a campaign, record it.
Click Save to save the template/paragraph in the Content Library.
See also: How do I create a new email template?