While I see others here who have had trouble with deliverability, I'd just like to say that I have never had a failed delivery to GMail/Google Apps, Yahoo, or M

While I see others here who have had trouble with deliverability, I'd just like to say that I have never had a failed delivery to GMail/Google Apps, Yahoo, or Microsoft. There are tools online which will receive email from you and help you configure your system properly for full deliverability. I suspect whatever this Helm thing is, they manage to do things right on that front as well; everything else I don't know.