Blogger catches up after stumbling
I think my "rush hour" conjecture was correct. My three failed email post attempts from an hour ago all just posted. No lost posts, but just a delay of an hour. Oddly, my previous post to this blog actually got through in the middle of that "rush." That may have just been chance, or maybe my other blogs are marked as "possible spam" and their inbound posts had to be quarantined for a while. Difficult to say.
Alas, now I will be more cautious about posting via email in the middle of the afternoon.
BTW, Blogger does show the proper message times, so it does not look as if there was any delay of transmission of the email to Blogger.