Mail Insists on Being "Push" Phone: Sprint Nexus S 4G with the ICS update.

I have email accounts (hosted Exchange) set up and working without issue. Well, one small issue: No matter what "Check Frequency" I choose, they insist on being "push" mode. I have one at 10 minutes, the other at 15 minutes -- but the second an email hits that inbox the phone dings. 

Drives me nuts -- and wreaks havoc with playing music...

Is there a setting somewhere else or new in ICS that I need to be looking for? Anyone else having a similar issue?
Contact your hosted Exchange provider to turn the Push off. They are enforcing it.

Another way: Turn your email notification off or set its ringtone 'Silent'. But, its inconvenient.