We've been dealt a bad hand, folks. A couple of the IP address blocks we were given have been blocked by the (very) big SpamHaus project. This has been a common occurrence for Amazon and their cloud services in the past. As a result, starting last Friday evening, the milepoint website has been unable to send most emails. Those emails have not been deleted as they remain in our queue and will resume delivery shortly. Results are promising right now -- and it looks like we're making progress (some mail is now getting out) but not all ISPs will be quick to respond. Edit: After attaching new IP addresses to our Amazon instances, mail delivery is continuing without issue.