Does anyone know how to stop my emails disappearing from my Iphone 4s?

My emails appear fine but then after approx a week they just disappear, I have tried to look in the settings but cannot see anything that has an expiry time.  Thanks

The primary server appears to only able to turn off. The others appear to be capable of being edited and then deleted.
Go to Settings/Mail, Contacts../ tap the account, then tap account and you should see the servers below if you have access to them.

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