Amazon SES - Scale your business email & marketing messages with Amazon Simple Email Service (SES), a cost-effective and reliable cloud email service. Sign up today.
Dynamically Personalized Emails by QGraph - Hyper-personalized emails for E-commerce
Mailgun - A set of powerful APIs that enable you to send, receive and track email from your app effortlessly whether you use Python, Ruby, PHP, C#, Node.js or Java.
Nova Inbox - Personalize emails in seconds, right from your inbox
Mandrill - Mandrill is a new way for apps to send transactional email. It runs on the delivery infrastructure that powers MailChimp.
InboxSDK - First usable API to write Gmail Apps for 1B active users