HT5704 I have a iphone 3G. How do I upgrade the IOS . My email no longer works and I get a message to upgrade my IO

How do I upgrade the IOS in my 3G iphone using the usb cable hooked to my computer ?

To view the version, use Settings > General > About and look down the list of details shown there; that will usually display the software version.
iOS 4.3.1 is the last version of iOS for the iPhone 3G. 
To upgrade iOS (if you're not already running 4.3.1), connect your iPhone to your Mac or Windows system via the cable, launch iTunes if necessary, and follow the instructions that should appear.
If you are already running iOS 4.3.1, there is no further upgrade.
What tool or application or support forum or message is presenting the message about your mail and the upgrade?

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