I woke up a short while ago after several hours of sleep and checked the iPhone. No new mail 🙁
Unfortunately, it appears the iPhone does not seem to be getting my Yahoo! Mail except when I manually retrieve it, and then it's one folder at a time! That's not going to work. Looks like it's another trip to the Apple store today to talk to one of their 'geniuses' and a call to Yahoo! Mail support to find out what's going on.