MediaFunnel - MediaFunnel supports multiple users on one or more Twitter Accounts or Facebook Pages.
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.
Mandrill - Mandrill is a new way for apps to send transactional email. It runs on the delivery infrastructure that powers MailChimp.
SendWithUs - Take control of your transactional email. sendwithus is the missing tool for marketers to manage and optimize transactional emails.
SocialReplay - SocialReplay: Daily snapshot of your social media accounts. For Professionals - From $5/month
Aritic Mail - Ariticmail is a transactional email delivery API for applications and enterprises.