Bah, I must have read this post while looking through things & cursed myself.
My email notifications were working fine until earlier today, but now am having the same problem with them not showing up. No notification icon or textual notification if I open up the notifications screen, at least not consistently. (A few different threads around on this problem. Wish they would fix it). (Also, does this issue only effect the email notification in-particular or will it also have the same problem with other types of notifications? Don't have a way to test that right this minute).
Anyway, is the only way to fix it to use an alternative email app? I'm actually fine with the standard one, but I'm guessing there's no app that
only deals with the actual notification stuff without replacing the whole mail system? (And using an alternative
will fix the notifications, right?)
If I need to use a different email app, any suggestions? The K-9 mentioned in the thread here looks like a possibility, but it's not totally grabbing me. (The functionality looks nice, but it's so... un-pretty.)

(My primary email is a POP3 through my ISP. I have a gmail account for app access & backups, but I do not use it for mail.)