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