Learn how to block duplicate user entries. This feature will make it so the same user and or can't enter multiple times with two different email addresses. We put in advanced safe guards to prevent cheating with this feature.
Admin view
First, navigate to create a new giveaway or edit an existing giveaway.
Next, navigate to the Basic Information tab and tick the Restrict multiple emails from the same person checkbox.

Note: the above example will allow an individual person to enter using 3 different email addresses. If you want to allow UNLIMITED email addresses for each person, you can can simply untick this checkbox.
Public view
If the same user tries to login with a different email address, they will be blocked and get the following error message:

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