Stop email on iphone 4s that i have already seen on my mac

I have just upgraded my computer to a imac and now I get every email on my iphone even when i have read it on the imac. how do you change my iphone to receive only email that arent read??

If the account is set up an Exchange or IMAP, the email is synced so everything is the same on all devices.
Only POP accounts work as you seem to indicate you want.

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