The Sharepoint designer 2010 workflow email body action is not a rich HTML, its not supported with this version but i found a quick way to add rich HTML in email body message.
Here is the steps:
- First create your HTML in dreamweaver or vs2010 or any other HTML editing tool
- Then open your workflow in SPD 2010
- Add “Send email” workflow action from ribbon
- Keep “Send Email” action selected/highlighted
- Then navigate to ribbon and select advanced properties
- Select last option Body
- Click on the button (...) to open the text pad
- paste your html including head,body and html.
- Click OK and open the action from workflow step
- Then add your lookups and test it.