There is so many different free services out there. E-mail marketing can tough. This is why you can't take a singular approach across the board. If you own a massage spa you can send out e-mails regularly. But if you own a seasonal shop exclusive for Christmas, Halloween etc e-mails may get ignored. So its important to know when, how and what to post. What kind of business do you own? Also are you in a big city/small town? Type of clients/ Any other factors to identify your business and i would be happy to come up with some good e-mail marketing free services and ideas for you.