If someone didn't ask to hear from you yet, it doesn't mean they won't want to hear from you later. It's your job to prove to them -- through helpful content and valuable offers -- that they should stay up to date with your company via email. If you force your email content on anyone too early, even if you know in your bones they're a great fit for your products or services, you risk preemptively losing their trust and their future business.
“Paper direct mail can be a nuisance to most customers, but if you include a product sample, the direct mail instantly becomes more valuable as a trial tool. There are several companies that specialize in creating product samples, such as Arcade Marketing for the fragrance and makeup industries, and they often have interactive programs that aim to increase the ROI for your brand.” ~ Doreen Bloch, Poshly Inc.
Another key aspect of any email blast is the target audience. Make sure you’re hitting inboxes where the probability response, purchase or interaction is high. If you’re shooting emails like a loose cannon on a rolling deck, you could put off prospects and customers (if you make it to their inboxes!), tarnish your image and end up wasting a lot of time, money and effort.