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SparkPost Go API client

Build Status Code Coverage Go Doc

The official Go package for using the SparkPost API.


Install from GitHub using go get:

$ go get

Get a key

Go to API & SMTP in the SparkPost app and create an API key. We recommend using the SPARKPOST_API_KEY environment variable. The example code below shows how to set this up.

Send a message

Here at SparkPost, our "send some messages" api is called the transmissions API - let's use it to send a friendly test message:

package main

import (

  sp ""

func main() {
  // Get our API key from the environment; configure.
  apiKey := os.Getenv("SPARKPOST_API_KEY")
  cfg := &sp.Config{
    BaseUrl:    "",
    ApiKey:     apiKey,
    ApiVersion: 1,
  var client sp.Client
  err := client.Init(cfg)
  if err != nil {
    log.Fatalf("SparkPost client init failed: %s\n", err)

  // Create a Transmission using an inline Recipient List
  // and inline email Content.
  tx := &sp.Transmission{
    Recipients: []string{""},
    Content: sp.Content{
      HTML:    "<p>Hello world</p>",
      From:    "",
      Subject: "Hello from gosparkpost",
  id, _, err := client.Send(tx)
  if err != nil {

  // The second value returned from Send
  // has more info about the HTTP response, in case
  // you'd like to see more than the Transmission id.
  log.Printf("Transmission sent with id [%s]\n", id)




  1. Check for open issues or open a fresh issue to start a discussion around a feature idea or a bug.
  2. Fork the repository.
  3. Go get the original code - go get
  4. Add your fork as a remote - git remote add fork
  5. Make your changes in a branch on your fork
  6. Write a test which shows that the bug was fixed or that the feature works as expected.
  7. Push your changes - git push fork HEAD
  8. Send a pull request. Make sure to add yourself to AUTHORS.

More on the contribution process