People like more choices, so consider creating subscription levels that let people sign up to receive content that’s relevant to them. For example, if you sell widgets and tax advice, provide three options on your opt-in form that allow users to sign up to receive info about widgets, info about tax advice or both. Further customize by allowing them to designate how frequently they’d like to hear from you — weekly, monthly or only when something really special is going on. People may be more likely to sign up for your email list if they have some control over the content they’ll receive.
Once your list is targeted, you need to spend an equally large portion of time coming up with a great deal – even if it means you might lose a bit of money on it. The underlying goal of any marketing campaign is to gain new customers, and it’s worth it to significantly reduce your profit margins to gain said customers. Once you have a surgically-honed list and an amazing offer, then you can spend some time on the design, copy, delivery methods, postage rates, date of delivery, size of the mailer…there are a lot of other options to consider, but following the 40/40/20 rule you can see how important audience and offer truly are.