cardinal_pythonlib.django.mail
Original code copyright (C) 2009-2022 Rudolf Cardinal (rudolf@pobox.com).
This file is part of cardinal_pythonlib.
Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at
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E-mail backend for Django that fixes a TLS bug.
- class cardinal_pythonlib.django.mail.SmtpEmailBackendTls1(*args, **kwargs)[source]
Overrides
django.core.mail.backends.smtp.EmailBackend
to require TLS v1. Use this if your existing TLS server gives the error:ssl.SSLEOFError: EOF occurred in violation of protocol (_ssl.c:600)
… which appears to be a manifestation of changes in Python’s
smtplib
library, which relies on itsssl
library, which relies on OpenSSL. Something here has changed and now some servers that only support TLS version 1.0 don’t work. In these situations, the following code fails:import smtplib s = smtplib.SMTP(host, port) # port typically 587 print(s.help()) # so we know we're communicating s.ehlo() # ditto s.starttls() # fails with ssl.SSLEOFError as above
and this works:
import smtplib import ssl s = smtplib.SMTP(host, port) c = ssl.SSLContext(ssl.PROTOCOL_TLSv1) s.ehlo() s.starttls(context=c) # works
then to send a simple message:
s.login(user, password) s.sendmail(sender, recipient, message)