External Form fields contain HTML tags?
By and large the module is extremely straightforward. But there's one fringe case that you may need to know about.
By default, forms integrated with Form Tools have all HTML/XML tags stripped from the submission data. This is a security measure; it prevents Evil People from doing Evil Stuff like performing XSS attacks on your site. But if your own (external) form contains a rich-text editor, you'll want to allow HTML being submitted. To fix this, make sure the "Strip tags in incoming submissions" field is set to "no".