In an age of omni-channel marketing, with marketers integrating social media and email marketing campaigns and digging deep into Big Data, the phrase “double opt-in” sounds a bit, well, old-fashioned. Who’s thinking about that any more? In other words, we’ve got bigger fish to fry these days! But hold on. There’s a little more to double opt-in than simply being extra diligent about the quality of your email list (although that’s still a very good reason […]