Increasing The Response to Your Email Marketing Program. Marketo is an on-demand marketing software company that helps mid-market and enterprise business-to-business marketing professionals drive revenue and improve marketing accountability. In Increasing The Response to Your Email Marketing Program, Marketo gives several great tips for business-to-business email marketing success: about subject lines, content, targeting, automation, and a lot more interesting subjects all related to email marketing success. A must read if you’re into email marketing!