Misleading error with fail_silently: "boto3 sesv2 client does not have method 'send_email'"

[technolingo]

Reporting an error? It's helpful to know:

• Anymail version: django-anymail[amazon_ses]==9.1

• ESP: SES

• Your ANYMAIL settings

  EMAIL_BACKEND = "anymail.backends.amazon_sesv2.EmailBackend"

• Versions of Django, requests, python

  Python==3.10.10
  Django==4.0.10
  requests==2.28.2
  boto3==1.26.113

• Exact error message and/or stack trace

  Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/gunicorn/workers/sync.py", line 136, in handle
  self.handle_request(listener, req, client, addr)
  File "/usr/local/lib/python3.10/site-packages/gunicorn/workers/sync.py", line 179, in handle_request
  respiter = self.wsgi(environ, resp.start_response)
  File "/usr/local/lib/python3.10/site-packages/django/core/handlers/wsgi.py", line 132, in __call__
  response = self.get_response(request)
  File "/usr/local/lib/python3.10/site-packages/django/core/handlers/base.py", line 140, in get_response
  response = self._middleware_chain(request)
  File "/usr/local/lib/python3.10/site-packages/django/core/handlers/exception.py", line 58, in inner
  response = response_for_exception(request, exc)
  File "/usr/local/lib/python3.10/site-packages/django/core/handlers/exception.py", line 143, in response_for_exception
  log_response(
  File "/usr/local/lib/python3.10/site-packages/django/utils/log.py", line 241, in log_response
  getattr(logger, level)(
  File "/usr/local/lib/python3.10/logging/__init__.py", line 1506, in error
  self._log(ERROR, msg, args, **kwargs)
  File "/usr/local/lib/python3.10/logging/__init__.py", line 1624, in _log
  self.handle(record)
  File "/usr/local/lib/python3.10/logging/__init__.py", line 1634, in handle
  self.callHandlers(record)
  File "/usr/local/lib/python3.10/logging/__init__.py", line 1696, in callHandlers
  hdlr.handle(record)
  File "/usr/local/lib/python3.10/logging/__init__.py", line 968, in handle
  self.emit(record)
  File "/usr/local/lib/python3.10/site-packages/django/utils/log.py", line 128, in emit
  self.send_mail(subject, message, fail_silently=True, html_message=html_message)
  File "/usr/local/lib/python3.10/site-packages/django/utils/log.py", line 131, in send_mail
  mail.mail_admins(
  File "/usr/local/lib/python3.10/site-packages/django/core/mail/__init__.py", line 134, in mail_admins
  mail.send(fail_silently=fail_silently)
  File "/usr/local/lib/python3.10/site-packages/django/core/mail/message.py", line 298, in send
  return self.get_connection(fail_silently).send_messages([self])
  File "/usr/local/lib/python3.10/site-packages/anymail/backends/base.py", line 114, in send_messages
  sent = self._send(message)
  File "/usr/local/lib/python3.10/site-packages/anymail/backends/base.py", line 144, in _send
  response = self.post_to_esp(payload, message)
  File "/usr/local/lib/python3.10/site-packages/anymail/backends/amazon_sesv2.py", line 91, in post_to_esp
  raise NotImplementedError(
  NotImplementedError: boto3 sesv2 client does not have method 'send_email'. Check AmazonSESV2SendEmailPayload.api_name.

• Any other relevant code and settings (e.g., for problems sending, your code that sends the message) None

[medmunds]

Thanks for the report, and for including the whole stack trace (which was essential to figure out what's going on here).

This seems to be a combination of some problems in your code or environment, plus an Anymail bug that results in misleading error messages.

First, the problems on your end:

1. Whatever request you made to your Django server failed, with an unexpected exception. Your server is trying to respond with a 500 error.
2. Your Django logging is set up to mail_admins to let you know about the problem. But Anymail was unable to successfully create a boto3 sesv2 client to send that mail. The most likely explanation is boto3 can't find the necessary credentials, though there could be other causes. (Have you successfully sent any email from this server?)

Django logging sends the email with fail_silently=True, so the correct behavior would be for Anymail to just ignore the configuration problems and not send any email. (And then you would hopefully discover problem 1 above in your log files.)

The Anymail bug is in the SESv2 backend: it should not be trying to post_to_esp if boto3 client creation failed and fail_silently is enabled. The "boto3 sesv2 client does not have method" error message is misleading: the actual problem is there is no client, and we should just ignore that if asked to fail_silently.

I'll fix the Anymail bug. In the meantime, I'd suggest either fixing your server settings so that Anymail is able to successfully send email through SES, or removing mail_admins from your Django logging config (if you don't want to receive email about errors).

[technolingo]

Hi @medmunds ,

Thank you very much for your prompt and detailed response! Indeed, I had misconfigured the boto3 environment variables. Now the issue is resolved.

Best