How often should I set my check for new messages option in my mail client

When setting up you mail client to automatically check for new messages do not set the time for less then 5 minutes.  If you set the time below 5 minutes you risking creating a mail loop. This happens when the time between automatically checking for new email does not allow enough time for the program to completely download the email messages before it starts to check again.  You will see that your mail clients continues to repeatedly try and download the same emails. 

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