I see this is a very common problem right now and hopefully one that will be fixed soon.
I cant send any emails at all from Outlook 2013. Something is up with Onedrive too, it synced everything onto my hard drive and now my hdd is full and I cant get them back to Onedrive, its coming up with an error too.
All this has been going on since W10 upgrade.
I have tried that system file checker thing and it says it repaired missing files but dont know where they were or if they were even to do with Outlook.
I've uninstalled and reinstalled and still the same. When I stop Onedrive running it still doesnt work.
Any ideas?