The tutorial provided explains trigger usage and email api usage as well as a fully working installable example making it easy for one to practice, test, and learn to write working plugins. Also on my site on the right hand side contained within the modules is a spew of resources to assist in learning PHP for example.
None of the incubator projects available to professional subscribers would be able to accomplish this. There is an Emails integration, but it is not conditional based off a fields value (planned to be added, but can't say as to when).