How can my eMail be kept on my iphone after deleting from server?

I've got a Yahoo Mail account linked to my iphone. It is set up using a standard Yahoo settings.

New eMail comes in OK & can be viewed.
But when it is viewed in Outlook on a desktop (which deletes it from the server), it then also deletes from the iphone.

Does anyone know any way to stop the iphone deleting to synchronise with the server. I only want it to download new eMail & for storage rules to be independent.

This works OK for other accounts running on POP & SMTP.

Don't quite understand the problem but my advice is to not use that feature

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