MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Mailzak - Give a boost to your #EmailMarketing
Kingmailer - Kingmailer helps you send, receive and route/forward emails.
rasa.io - Get more from your email list.
Marble Responsive Email Designer - Marble helps you design beautiful and mobile-friendly emails and newsletters.
Mailblast - Email marketing on a budget using Amazon SES