You would have to add the columns that you wanted to include in the email to the recordset on the sendemail page itself.
Then you could refer to the recordset values in the body with:
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.