What about an email to players that have cancelled letting them know about the coming update? If this has been mentioned in these pages sorry, not going to sift through all that at this hour. Just an idea is all.
The fast path to getting all our emails blocked. Yes Virginia, players who have quite get an unsolicited email from us complain to thier ISP and BINGO!, we are blocked from sending email to anyone on that ISP.
We learned that lesson the hard way.