Say you’re launching a beta test soon or collaborating with someone on a side project outside your typical newsletter scope. In an installment of the newsletter you usually send, briefly mention the project and provide a link where interested parties can go to sign up for updates about it. This way, those who aren’t interested only had to hear about it once and in a non-invasive way. A user experience win and a win for you, the guy who has two thumbs and a super-engaged email list sub-segment.
You want to have a single purpose for your direct mail piece. Often times the goal of a direct mail campaign is to get the recipient to buy a product or use a service. Other goals can be to send people to your website, get people to enter a contest, or let people know about an upcoming event. Knowing your goal will help you formulate what you want the direct mail piece to say. You also need to consider what the recipient stands to gain from the letter.