Whenever I send an email using Apple's Mail app (usually when sending a photo or link) it gets stuck in the outbox and never sends. I have to go in to the outbox manually and re-send again to get it to go. Anyone have any ideas on how to fix? I've tried resetting network settings and deleting both my gmail accounts and re-adding them and that did not fix it. This has been going on for at least 6 months and hasn't got fixed in the last few updates. I'm on iOS 9.2.1 and both my mail accounts are gmail accounts.