It is important though to give an option to all people who visit your business to subscribe to your list, no matter what method you follow in mailing list the first place. Newsletters can also prove very helpful if you want to have a responsive mailing list. Newsletter help people stay informed on several issues and are sale letters reflecting the quality and mailing list service of your business, so you have to make them as good as it gets.
Reports, incentives and pieces of information are always welcome and have a good percentage of response from customers and recipients so don't overlook them at any case. Speaking of incentives, you need to remember that there mailing list are many things we don't usually consider important, that can prove very helpful when building a mailing list and when offering something to our readers.
Internet marketing depends on gifts and people enjoy them anyway, so why not doing the same and getting some good feedback from your mail recipients? Making yourself look like an expert on a particular niche is something that always mailing list counts on customers' opinion, so if you try to do the same it is most likely that you will get the response you need.