I have the Sprint HTC EVO 4G. In the mail client, I have two accounts. One is set to access an Exchange Server. Even though it is set to ONLY check manually, in both peak and off peak times, it keeps checking at specific times. For a while, it always checked at 5:53 PM. Now it is automatically checking about 7:30 something AM. How can I get the system to observe the rule to check manually only?