Does not work with Django 6.0

[sushant354]

Traceback (most recent call last):
File "/home/ikorg/.indianlaw/lib/python3.12/site-packages/django/core/handlers
/exception.py", line 55, in inner
response = get_response(request)
^^^^^^^^^^^^^^^^^^^^^
File "/home/ikorg/.indianlaw/lib/python3.12/site-packages/django/core/handlers
/base.py", line 198, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/ikorg/.indianlaw/lib/python3.12/site-packages/pylaw/members/users.
py", line 230, in signup
registration_profile.send_activation_email(site)
File "/home/ikorg/.indianlaw/lib/python3.12/site-packages/registration/models.
py", line 456, in send_activation_email
email_message.send()
File "/home/ikorg/.indianlaw/lib/python3.12/site-packages/django/core/mail/mes
sage.py", line 358, in send
return self.get_connection(fail_silently).send_messages([self])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/ikorg/.indianlaw/lib/python3.12/site-packages/postmarker/django/ba
ckend.py", line 56, in send_messages
responses = self.client.emails.send_batch(*prepared_messages, TrackOpens=sel
f.get_option("TRACK_OPENS"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/ikorg/.indianlaw/lib/python3.12/site-packages/postmarker/models/em
ails.py", line 447, in send_batch
return self.EmailBatch(*emails).send(**extra)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/ikorg/.indianlaw/lib/python3.12/site-packages/postmarker/models/emails.py", line 301, in send
emails = self.as_dict(**extra)
^^^^^^^^^^^^^^^^^^^^^
File "/home/ikorg/.indianlaw/lib/python3.12/site-packages/postmarker/models/emails.py", line 282, in as_dict
return [self._construct_email(email, **extra) for email in self.emails]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/ikorg/.indianlaw/lib/python3.12/site-packages/postmarker/models/emails.py", line 291, in _construct_email
raise ValueError
ValueError

[umbrae]

I also ran into this with a little side project.

TL;DR:

Django 6.0 modernized its email API - https://docs.djangoproject.com/en/6.0/releases/6.0/#adoption-of-python-s-modern-email-api - The EmailMessage.message() method now returns Python's email.message.EmailMessage instead of the legacy SafeMIMEText/SafeMIMEMultipart classes.

In postmarker/models/emails.py, _construct_email checks for specific types:

  def _construct_email(self, email, **extra):
      if isinstance(email, dict):
          email = Email(manager=self._manager, **email)
      elif isinstance(email, (MIMEText, MIMEMultipart)):
          email = Email.from_mime(email, self._manager)
      elif not isinstance(email, Email):
          raise ValueError  # <-- This is hit with Django 6

I think this needs to be updated to support email.message.EmailMessage.

It looks like using anymail will suffice as a workaround for now.