Issue with the distinct() function when specifying a field to run it on

[adofosam]

When I attempt to run the following code, I get a error.

Code:
"""
user = User.objects.get(id=user_id)
list = List.objects.filter(user=user).order_by('email').distinct('email')
"""

Error (Context: my app is called "lists"):
"""
django.db.utils.ProgrammingError: SELECT DISTINCT ON expressions must match initial ORDER BY expressions
LINE 1: SELECT COUNT(*) FROM (SELECT DISTINCT ON ("lists_list"...
"""

I'm using a postgresql database and my list model is as follows:
"""
class EventList(models.Model): # List for Marketting

id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, unique=True)
user= models.ForeignKey(User, on_delete=models.CASCADE)
email = models.EmailField()

"""