I don't know Pages. But if you can convert these Pages documents to HTML, you could use the [https://addons.mozilla.org/en-US/thunderbird/addon/stationery/ Stationery] add-on to use them as templates for new messages. However, templates designed in document design tools such as Word, Dreamweaver and FrontPage often don't sit comfortably in email. They may use complex folder structures and advanced features that email clients are not equipped to render. HTML documents usually have an accompanying folder for images. Email doesn't know what to do with these folders. Much safer to use Thunderbird itself to create templates. Then you'll know everything you do is within its capabilities. # Create a new HTML formatted message. # Select all (ctrl+a on a PC, YMMV) and delete to clear any signature stuff (if not required). # Compose your template as if writing a new message. If you use '''Insert|Image''' to add graphics, make sure you tick the "attach this file" checkbox. # Use '''File|Save As''' to save it as an HTML file, and use Stationery to select this or any other HTML template file when you write a message.