Email marketing is the most effective way to generate leads and target customers. Interestingly, it is capable of offering a ROI as high as 4400%. This means, for every $1 of investment, you can earn $42 of returns, which is phenomenal. However, the success of your email marketing campaigns depends directly on the accuracy of your email list. And when it comes to acquiring the most active and targeted email addresses, email appending services become very useful