We're a company that have a social gaming site, and we have a mail list of approx. 80K members that we usually send to our monthly ads and/or campaigns (and this list will be growing gradually with time).
We're currently using MailChimp as a service for bulk e-mail sending; but we're currently thinking that this is going to be expensive or time-consuming to continue using it for such sending. We thought that since we have a mail server (MailEnable) on one of our servers we might use it for this purpose OR to avoid spamming headache try to search for a cheaper service to use. Any advice regarding this?