+1 for SparkPost as well. They increased their free tier to 100k along with a commitment from the CEO to honor it for the life of the account. https://www.spark

+1 for SparkPost as well. They increased their free tier to 100k along with a commitment from the CEO to honor it for the life of the account. https://www.sparkpost.com/blog/my-promise-to-developers-sparkpost-pricing/#.VvAhthIrJB https://www.sparkpost.com/blog/my-promise-to-developers-spar...