Many businesses, churches, or other organizations that could benefit from having newsletters don't have the time or resources to it themselves.
A newsletter service can be useful to those businesses by providing them with an inexpensive way to promote sales and product updates former customers, as well as attracting new customers.
If you have a computer, and a decent printer, you can provide this service to them at a reasonable price. In fact, newsletters can be in print or electronic, so you really don't even have to have a printer.
You can advertise this service by placing ads on your website, in newspapers and direct mail methods. If you choose direct mail, use nice stationery with a clean design. This will be their first impression of your work, and first impression count for a lot in the business world.
If you already have a popular ezine or e-newsletter, you could start a website to share with others what they need to know about creating successful ezines.
You can provide your own observations and tips for creating quality ezines, finding and creating quality content, designing templates, design factors, avoiding spam mistakes, privacy and opt-in, and you could even offer your own ezine design services as well.
Provide quality resources for ezine and enewsletter services, graphics, content, etc. and ezine publishing tools.
You can share tips on promoting your ezine, selling advertising space, as well as sell ad space on your website and earn additional income.