This was a great article and covered most of the things I've learned "the hard way" about SPF/DKIM/DMARC.

My only beef is with this:

> If you're running a large domain, you'll get a bunch of these reports. If you're running a small one, you might be able to handle it yourself.

Even with a "small" domain, you're looking at basically another part time job to analyze these reports. It's not fun, and you grow tired of it very quickly. Sure if you're running 1 website, and that's all you do it might make sense. But for a web firm like mine (serving small biz), there's no way I can set this up for clients without charging them an extra fee and most aren't willing to pay me to spend several hours each week analyzing DMARC reports.