This is a Ruby library created for wrapping the Gmail API. This unofficial library provides access to all essential Gmail functionality like: searching, archive, delete, read/unread flagging, and reading and sending emails. Hosted on GitHub, the library documentation includes installation instructions as well as extensive code examples.
Campaign Monitor, the email marketing software aimed at designers, recently announced a massive API update that is sure to please developers. The changes are less of an update and more of a complete redesign from the ground up. The folks down in Sydney have gone RESTful, the new version no longer supporting SOAP. The API also added realtime tracking and integrated powerful segmentation tools.