Commerce Server Direct Mailer

Email Marketing Software / Services – Which One is the Best?
https://www.ventureharbour.com/email-marketing-software-tools-one-best/

6 Email Marketing Software Reviews: Software For Every Budget
http://blog.crazyegg.com/2012/12/17/email-marketing-software-reviews/

Email Marketing Services Review
http://email-marketing-service-review.toptenreviews.com/