Roundcube - Web-based IMAP email client
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
HEY - Email at its best, new from Basecamp.
Kingmailer - Kingmailer helps you send, receive and route/forward emails.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
Awesome Mails - Awesome Mails creates beautiful image map emails, featuring an easy to use drag-and-drop editor...