dstegelman/django-mail-queue — pull request #28 by eugene-wee (2013-06-26 17:27:16+00:00)
Title: Remove null=True from MailerMessage model's string-based fields

As discussed in our email conversation, the Django documentation recommends not having null=True for string-based fields in models:
https://docs.djangoproject.com/en/1.5/ref/models/fields/#null