Well, you can look at the headers of the message once it makes it to the list. For the FTBFS message (which I am ignoring as requested ;-)) my server did not receive the message until after 4:00 CDT, while it was sent at around 2:00 CDT. I wonder if something upstream from me is delaying list traffic, or if the big Email providers just delay sending mail for that long?
Okay, so there is a delay --- somewhere. I am now getting messages I sent much earlier today.