A bunch of friends have been forwarding around this link to an article from "EContent" entitled "Research Finds Email Senders with Strong Subscriber Engagement Are Likely to See Less Email Delivered to Spam"
On one level, duh.
But also, on another level, it's great to see this supported with research. There are always people out there who doubt what we in deliverability see and explain every day. Sometimes you even run into people like that one guy who ran that agency that went under whose whole shtick was telling people to do the opposite of what deliverability consultants said. It was bad advice, and that kinda thing gets tiring after a while.
So I'm very happy to see Return Path data and analysis supporting what I know to be the best path.
Go straight to the source (here) to get access to the full report.