The Developer Marketing Guide
> Email might not be the most attractive means of communication, but newsletters are direct and exclusive to customers, a good starting point. “You should have an email newsletter if you have nothing else... This is the one opportunity you have to make something just for them that no one else consumes.”<p>I'd love to see some broad evidence that email newsletters are effective. I've experienced no strong correlation myself between the frequency of sending newsletters and sales.<p>The strongest argument I've heard for email newsletters is, "it can't hurt, so you should do it just in case it helps." But that ignores opportunity cost.<p>Can anyone (preferably who doesn't work for a email campaign company) give any strong evidence in favour of regularly sending out email newsletters?