Fetching email from Outlook

Fetching email from Outlook

Hi,
 
I was testing email request using my email account in Outlook.
I set my email account in Mail Configuration in Admin, and it fetched all my emails in my account (which is correct).
However, it transferred all mails instead of just copying them to app.
Is this the way it should be?
I don't keep any email request in the email account?
 
Thanks, 

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