Means it didn't send. I used to have that issue when my phone wouldn't be fully activated on our BES. Not saying you're using a BES, but it means it didn't send.
i just installed 109 and i was looking at emails and saw this red x next to a few emails
Is this an OWL account? I have the same issue after OS upgrades. it can be an e-mail I sent or an e-mail I got. For me this only happens on my OWL accounts. I just ignore it.
Yeah, look at my thread. Also, don't think for one second that it's a 109 bug. It's not, it happens with all old email, but only after an OS install. There's an issue somewhere and I aim to bring attention and a fix to it someway. It bothers the bajesus out of me every time I see an X on an old email I keep around for information purposes.