The success email? You mean a specific email announcing that I've successfully configured SSL? No.
Today, after I realized that the certificate was still the self-signed one, I went back in and pasted my certificate in (again). I don't know why it didn't work the first time, though I do recall that this was during a time when the admin panel was quite unresponsive, so it's possible that the first update never took effect.
Now, if you go to https://www.checkerbox.com, you'll still see a certificate error -- but only in Firefox. But now the certificate is shown as being issued by Starfield Technologies, which is the provider whose certificates GoDaddy resells. So the right certificate is in there now.
So: Is this problem a function of my particular browser configuration? Do you see it too? If you do see it, do you have any idea why the certificate error appears in some browsers but not others?