This SDK is a wrapper for SendGrid in Go. It is a library to simplify the process of using SendGrid's X-SMTP API. The SendGrid SMTP API allows developers to specify custom handling instructions for e-mail. This is accomplished through a header, X-SMTPAPI, that is inserted into the message. The header is a JSON encoded list of instructions and options for that email. SendGrid’s platform, tools, and expert services team provides a way for developers and marketers to craft, segment, test, and deliver all of their email and includes: purchase confirmations, password reset instructions, an upcoming sale, or a nurture campaign and more. It is a customer communication platform that delivers 35+ billion emails each month.