Yesmail - Yesmail provides email marketing solutions that integrate mobile, web, and social channels for marketers.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
ClickMail - ClickMail provides enterprise level email marketing software tools, providing email deliverability and authentication.
PostageApp - PostageApp is an email management service that makes it easy to design, deliver, and manage all of the email that websites or applications send.
MailPlus - MailPlus is a Dutch-based email marketing solution provider.
MasterBase - On demand Email Marketing software