I went ahead and sent myself a test message and it all seems fine. It looks and functions properly. Still I wonder if it will cause it to become spam, as the error message suggests.
Also, if there is any easier way to alter the links in the header and footer of the templates, I'd love to know. Talking about the "web preferences/web version/unsubscribe" type of things.
Nevermind, I figured it out! Thanks!
In regards to making the templates more editable, that's a solid suggestion! We'll certainly let you know if we make this possible in the template builder. In the interim, you will need to export the templates to achieve this level of control. Be sure to let us know if you need any assistance with this :)