Email problems only on wireless network

The problem: I was suddenly unable to send or receive emails, with the error message "The server cannot be contacted on port 110". My mobile Me email account is unaffected using the same computer and same mail program (mac mail).
And it gets stranger...I am able to use my iphone to access my emails, as long as I use 3G. If I connect to the wireless network in my house, the iphone says it "The connection to the server failed".
I am assuming it has something to do with either my modem or airport express settings. I'm not sure how they could have changed though.
Any help gratefully received.

Welcome to the discussions!
Power down your system for 5-10 minutes. Power the modem back up first for at least 5 minutes, then the Express, and finally your computers.
Any help? If no luck, contact your ISP to have them do a line test and verify that they are not blocking access or ports on your network. Then, if needed, reconfigure the Express again after a hard reset of the device.

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