[mteagster]

I had the same problem with my diamond. The rom that I was using saved the emails to the internal storage card. If the rom that you are using is saving the emails to your storage card, go into your storage card file and delete the "cemail" file and it should delete the "ghost" email. However, back up your existing emails just incase.
I did this and it took care of the exact same problem that you are having.
Im not a pro at this stuff, so please research incase I am giving bad info.
All I know is that it worked for me
good luck