The MyNewsletterBuilder PHP SDK by MyNewsletterBuilder wraps the API to access email marketing capabilities that can be used for newsletter features. It is available for download from the main site and it requires PHP 5+ to interact with the code.
As a developer, you can figure out how to make your program connect to Facebook, Twitter, SMS, and Email. Or you can use the Embarke API and connect just to Embarke, a messaging platform that connects you to them all. You can skip learning the specifics of how to connect to each of them. The REST API's website has a five minute tutorial video on how to use this gateway to its developer tools for social communications.
SendGrid, a leading cloud-based email service, has announced that the company has joined the Google Cloud Platform Partner Program giving App Engine developers a trusted third-party and non-native option for adding transactional email management and delivery services to their applications. In addition, Google App Engine customers will have access to SendGrid APIs, real-time analytics and reporting all of which are powered by Google services infrastructure.