I see a number of people have experienced the same problem as myself, BT Emails stopped syncing with an Android Tablet devices, however all other (GMail etc), continue to sync.
My BT Emails have stopped syncing with with Samsung Tablet, however they continue to update (luckily) on my Samsung phone!
However, if I search for the email on the tablet, I can find new emails, which then appear in the in box!?
This has only just started to happen, GMail continues to update.
I've not changed any settings, I've cleared cache and restarted the device twice!
Any ideas, its driving me made!!
Thanks
Which email app are you using?
Have you checked and carried out any app updates from the Playstore?