Thanks for your advice Alex. My team does a great job of trying to get the correct email addresses, in fact part of their bonus is based on just that. I expect quite a few to bounce back due to incorrect email, no longer using email etc...However, a large amount of them come back with the message "undeliverable due to IP/domain bad reputation" or "blocked by blacklist/blocked for abuse". I think 10 to 15% are probably bad email addresses, but to add another 15% on top of that is pretty high. The email blast bounce back isn't a tragedy because I don't believe in pounding customers constantly w/ ads anyway. W
hat is a tragedy is when a customer sends us a price quote request & our response goes straight to their junk mail or is sent right back due to blacklisting/domain bad reputation.