[Joe Moore]

Well, there's no need to troubleshoot an issue when we know exactly what the issue is. Some email providers block auto-generated emails from our servers. With this method some sites are blocked, with the regular delivery system other sites are blocked. It's been happening since, roughly, 2003.

We tried a long shot idea to get around it, and while it worked for some domains, other domains wound up blocking it. Right now, our only options are to leave it as is or switch back to the old way. Some people aren't going to get emails. It's just the way it is.