I've tried restarting, unchecking gmail sync, refreshing, syncing manually, etc.. It all started when I tried to send a large file using AndroZip via Gmail. It was stuck on sending so I deleted it. Since, then I double checked that it is out of my outbox and drafts. I try sending a test message and it stays on "sending". If I go to Gmail, I can see that I have new mail that's not being pushed to the phone. Any help on this is appreciated.