=> str(ugettext_lazy('')) '<django.utils.functional.__proxy__ object at 0x0>'
Ensure you're always working with unicode. For me, it turned out that a certain Django mail backend called
str() on the subject line of an email who was using i18n strings.
I had to manually coerce the values using
unicode(ugettext_lazy('')) in order for users to stop receiving emails with subject lines referring to memory addresses.