Instead of simply sending out a broadcast sporadically, why not choose to create a newsletter. That way, you can send one out each week/month that includes said promotions, offers, site updates, etc. in one place. That way, subscribers won’t get annoyed of you sending out too much content to them, as they can expect to get everything in your regular newsletter.
ashley.. try benchmark as well. the differences i can see, for me anyway are we have 3 products, so want a different company name to show for each, and if they opt out i wanted the option of which list they want to opt out of, even if i send them letter A from list A, but maybe they are also in B and C, they might still want letters from b and c just not A, benchmark and i believe aweber does this. benchmark also allows you to set up a whole load of detailed surveys as well which is cool. mail chimp, if someone opts out of one list the lists are not linked in anyway so then you have to manually check them out of the other lists, and have to assume they want out of all with out giving them the option to chose in and out of what lists.
Email marketing has the highest conversion rates of any marketing channel. In fact, sixty-six percent of online consumers made a purchase after receiving an email marketing message — which is more than social and direct mail, according to the Data & Marketing Association. And transactions from email are three times more profitable than those made on social media, reports the global management consulting firm McKinsey & Company.