I attached a couple of zip files to an email without noticing how large they are (42 MB each, making that email 84 MB). I realized my mistake when Notes began to sync and was taking forever, so I stopped the sync. 

But there doesn't appear to be any way to remove emails from the outgoing queue, or to even view that queue.

Is there a way to delete that message from the outgoing queue? I don't care if it's completely lost.