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While looking into the settings documentation for a project of my own I stumbled upon a setting that reminded me of your question.
Since Django 1.7 there is a setting to silence certain warnings. If you are using Django 1.7 or later you can add the error code to the SILENCED_SYSTEM_CHECKS setting:
# settings.py
SILENCED_SYSTEM_CHECKS = ["auth.W004"]
Source: https://docs.djangoproject.com/en/1.7/ref/settings/#silenced-system-checks
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Warnings are there to help you, so mostly it is best to improve your code to avoid them.
In this case you really do not want to turn of that warning. If you read the warning, you see that currently there can be two different users with the same username!
To solve this, you should make the email field unique by adding unique=True to the field definition:
email = models.EmailField(unique=True)
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Source:stackexchange.com