Kim Gjerstad, one of the founders of Mailpoet, visited with Mark at the Wordfence booth at WordCamp US. Kim and Mark talked about the origins of Mailpoet, the plugin that gives users a full email management system within the WordPress administrative dashboard. They talk about email deliverability as well as the challenges of fighting email abuse, a constant battle that Mailpoet is winning. They also talk about net promoter scores and what it means for the success of a SaaS business.