It would be great if you guys would add Google Apps Script to your how-to's and code samples. Google has reduced the amount of emails many clients are able to send from their Mail API resulting in a flurry of conversation in the Google forums. One user has posted a workaround with some Google Apps Script Code that utilizes MailGun, which is how I found you.

This seems like a great little marketing niche/opportunity for you guys.

See 4th post in this thread: http://stackoverflow.com/questions/21444588/has-google-lowered-the-email-limits-for-google-apps-script