My husband and I are both having the same issue with our Samsung email. Every morning, the app shows as syncing or synced on the time stamp but the body of the email box says there may still be emails on the server that are not retrieved. It doesn't show old or new emails. If I log into my email on the computer it shows all the emails I got overnight. This morning I had 1 new Email, started reading it, then it disappeared and showed the above. Update: now it isn't syncing at all. Blast!
Then around 9am-ish, all my emails come back. All my settings, unless there is a secret one I'm unaware of, show that it should be syncing all the time with all my emails (not just the last month or similar)
Thoughts? I have 2 email accounts linked to my phone, hotmail and a school/outlook server email. Neither working.