For a list of all components and usage examples check out the emailJS GitHub organization. Components that belong to emailJS are MIT licensed.
The components were originally written by Andris Reinman (@andris9), the author of Nodemailer. They are maintained by him, Felix Hammerl (@felixhammerl), and Andrew Sutherland (@asutherland). Among others, Mozilla also uses them in the stock email app for Firefox OS 2.1.