I want to send an eCard as a link that opens up in the web.
You can do that by creating a new stationery and instead of adding an image, you can create the text you want to link, and highlight the text. Click the link icon in the WYSIWYG editor, and select "Browse Links". Click "Email" and select View Message. This will generate a link in the eCard that will then open in the browser for a user when clicked.