A client of mine was asking for a solution to send newsletter mails to a list of subscribers. I looked around for a module, but couldn't find any. Then I saw a screenshot on this blog post about UIKit update, and decided to recreate it. Huge thanks to @ryan for the inspiration.
The module uses regular pages for building HTML content. These pages can be used to create a fallback link in emails (i.e. "Use this link if you can't view email properly"). During render it injects $page->mailerM