DirectIQ allows you to determine whether your template has the potential to be flagged as spam, check your template code against the web's most popular spam filters with Spam Doctor. Go to Templates -> My templates and select a template you want to check. Then click on the menu button in the bottom right corner and click Spam Doctor in the context menu.
Wait a few minutes for the results:
Once complete you will see the report showing whether your email will go to the spam folder by passing various email clients tests.