This library written in PHP provides a CodeIgniter wrapper for the SendGrid Newsletter API. SendGrid's Newsletter API allows users to access data and interact with the newsletter app portion of the SendGrid product.
MailZ, transactional email delivery service, offers the MailZ API to enable systems and applications to incorporate email response features. MailZ features enable third party apps to deliver single-recipient emails after integration with the MailZ API. MailZ supports a wide range of content management systems and email platforms. In addition to automated email responses, MailZ delivers analysis and tracking tools for a more powerful email response system.
SparkPost announced a version of its SparkPost API that is fully compliant with the upcoming GDPR in the EU. SparkPost EU is hosted in Europe as opposed the the US where the original API is hosted. The EU version brings compliancy as well as lower latency and increased performance to EU customers.