Problems sending and receiving emails using exchange when on wifi - OK when using Sim Card

I've an iphone 4S using Exchange to link up with company server, this works fine when using 3G - phone's Sim Card. But when I join a wifi network I can no longer send and receive emails until I disconnect from the wifi network.
Has anybody any ideas?

Hi Derick,
you need to make sure the following is met:
1- router is correclt setup and antennas are plugged
2- users are withint good range from the router
3- use a good channel for the router, one of either 1, 6 or 11. try to figure out which is the best channel to choose using a freeware site survey tool.
4- ssid configuration doesn´t involve eap and session timeouts.
if you have doubts, let me know
cheers
Serge

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Problems sending and receiving emails using exchange when on wifi - OK when using Sim Card

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