How can I prevent duplication of incoming emails?

I need to find out what is causing about 40% of emails received from being duplicated and then fix it once and for all. I don't leave messages on the server. I read the article on this topic but it seems hit and miss try this try that; I want something a bit more professional please.

As You have no idea of the cause then no one can offed more than try this try that. that is what diagnosing the problem is all about.
I have problems with outlook.com. As far as I can work out it is because it is a crappy service? Who are you have problems with?
Have you tried without your anti virus scanning incoming mail. It is the number one cause, but again it is try this try that.
There is nothing black and white in computer issues after "Is the power turned on?"

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