I've recently got a HTC 710s and when I'm at home where my phone connects up to my WiFi I get emails delivered to my phone sometimes faster than they arrive on my PC, however when I'm away from home I've noticed that the majority of emails don't seem to reach my phone, i can sometimes return home to a full inbox on my pc. Does anybody know what can be causing the problem? some emails do still filter through to the phone from time to time, and even when i manually do a send / receivee it says 'checking for changes' but then downloads no messages?
Anybody else had this problem? and if so, how did you resolve it?

Thanks
Mark