Email App On Android

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http://androidforums.com – Hi All. I'm new to this so i'll try to explain my problem. I have just received the ZTE Grand X running ICS, when I open the email app my emails disappear after the "loading messages" stopped. I also have Gmail set up which displays my emails. On the gmail app I have two accounts set up, one of which is the same as the email app. Also my emails have stopped coming through to my PC (Outlook Express). I used to have a HTC Wildfire where the emails worked fine. Is this a phone problem, a Gmail/Google problem or my ISP problem. Thanks in advance. (General)