Note 2 Email Sync Problem! Main Account doesnt work, only second account works!!

A

AC Question

Hello everybody,

lately i found out, that my main account on my Note 2 doenst sync anymore.
The button with "sync email" ist already clicked on.
Any Sync ist activated.
The System shows me the following: Last Sync 23.08.2014.
But todays the 27.08.2014.
Why does my second email account work with another email adress?
I have been updated to KitKat since about 2 weeks.
How can i solve this problem?
Many thanks.