iPad disables iMac e-mail

We have two iMacs and an iPad on our airport network. When the iPad is in use--even if not for mail--the iMacs won't receive e-mail. What causes this and what can I do to correct it?

If I'm checking the news on the iPad and my wife is not getting e-mail for her work, it causes problems.

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Clarification Request
Some ISP's do not allow more than one device

to be on the network, and configured to receive mail from the same account, at the same time.

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iPad disables iMac e-mail

Clearly not the case with out ISP. In addition to the iPad and iMac, we access e-mail on another iMac, an iPhone and an iPod. None of the other combinations cause problems.

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