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Flexmail Solution - Professional email marketing with powerful and easy-to-use features
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Mizmoz - Easy-to-use, state of the art, email service provider dedicated to support growing businesses.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Kingmailer - Kingmailer helps you send, receive and route/forward emails.