If you select the option to use one of the built in templates for your email, the multiple checkboxes will automatically be converted using the explode function, if you design your own email though, you will need to include that code
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.