The following are tips to improve your relevance, and in turn, your ROI: Build a relevant mailing list. Your list should be populated with email addresses of people who have opted-in to be in your mailing list. This would assure you that these people are already interested in what you have to offer. You have to make sure that these people are given clear and concise details on your opt-in practices.
This is very important as building the trust relationship with your client base from the very beginning is crucial. Know mailing list your customers. Knowing your customers - their interests and preferences, is very important. You have to gather as much data about your mailing list as you can. You have to do this in the least invasive way possible as most people are not comfortable sharing a lot of personal information over the internet.