The better you know your customers, the better you can help them. You need to know their pain points, understand them and their purchasing process, and ensure your sales pitch is personalized to their needs. Do this by segmenting your lists and personalizing your emails—create emails that feel as if they were sent specifically from one individual to another.
The more personalized your sales process, the more success you should see. You can learn more about using demographics and data to understand your customers better in the infographic below.

Via Salesforce