Communicate directly with your clients in a highly personalised way.
Email is a reliable and cost effective form of communication between your brand and your customer. It has a high return on investment rate, and is relatively simple to manage once it is set up correctly.
Email marketing is still one of the most effective marketing strategies out there. Sure, you can email directly from your regular email software. But using proper newsletter software adds a bunch of features which make your efforts measurable - you can not only see who's received each newsletter but also who's opened it (and when), who's clicked on links... and who hasn't. This helps you refine future efforts.