Default [Q] lg g2 problem with zimbra

hi,
I have a new lg g2 and I have some problems with the default email client with our emails on a zimbra server.
The server Is an open source edition with zextras zimlet for the sync with mobile devices.
I configure correctly all parameters, email, calendar and contacts are synced correctly..
The problem is that I cannot reply or forward the emails, the option is locked.. I can only create a new email...

I try a different account on a exchange server ad I haven't problems, it function correctly...
I try a different email client downloading touchdown for mobiles and function correctly with my zimbra account, but I prefer to use the integrated email apps...
On other devices (for ex Note 3) function correctly with integrated email software...

What can I do?
Thanks