I think it will be more helpful, if I know your line of business? What I used for my restaurant service business is, I did direct mail marketing, instead of the traditional email marketing. Mainly because, the emails that we forward them, might be considered as spam by some, and might not be even noticed by many. On the other hand, when we go for direct mail marketing
, the customers will have a personalized feel. I send them details about the offers, discounts and coupons etc, and it is really effective for me. I think even you could try this. Direct mail marketing has lot of advantages over the email marketing. Hope this helped.