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iOS 5 gives you two ways to search for email messages, and, frustratingly, the more useful of the two isn’t available in Mail! However, I’m delighted to say that both methods of searching can, at last, look in the contents of your messages, and not just their headers as in previous iOS versions.
To search within Mail, scroll to the top of the message list for any mailbox (or, on an iPad, simply be sure the message list is visible) and enter some text in the search field. Then tap the Search key. Mail displays matching messages from the current mailbox; tap one to display it.