This PHP SDK is for generating SendGrid X-SMTPAPI headers. SendGrid is a cloud-based platform for sending and managing email, and generating email analytics. Composer is recommended for installation of the SDK. After installing and configuring the SDK to send email via SMTP, use the provided code snippets to configure headers like categories, substitutions, or filters.
Context.IO, an e-mail API provider, has announced a "lite" version of its popular Context.IO API. The Context.IO Lite API is not a replacement for the original API. Rather, Context.IO Lite started as a small project to improve Webhook performance. The potential of Lite quickly made itself known, so Context.IO decided to fully develop the Lite version and has now launched a beta version.