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Editorial Team
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Asked: 2026-06-13T14:57:38+00:00

My test code started failing with GAE version 1.7.1. I went back to 1.7.0

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My test code started failing with GAE version 1.7.1. I went back to 1.7.0 to wait for a fix but my test code is still failing with 1.7.2. Here is a minimal test that causes the failure:

mail.send_mail("sender@example.com", "receiver@example.com", 
               u"sübject".encode("utf-8"), "body")
mail_list = self.mail_stub.get_sent_messages()

And I get the following error:

Traceback (most recent call last):
  File "/Users/.../tests/unit_tests.py", line 19, in testTest
    mail_list = self.mail_stub.get_sent_messages()
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/apiproxy_stub.py", line 184, in WrappedMethod
    return method(self, *args, **kwargs)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/mail_stub.py", line 183, in get_sent_messages
    email_message = mail.EmailMessage(mime_message=mime_message)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/mail.py", line 742, in __init__
    self.update_from_mime_message(mime_message)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/mail.py", line 1213, in update_from_mime_message
    super(EmailMessage, self).update_from_mime_message(mime_message)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/mail.py", line 1093, in update_from_mime_message
    subject = _decode_and_join_header(mime_message['subject'], separator=u'')
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/mail.py", line 558, in _decode_and_join_header
    for s, c in email.header.decode_header(header))
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/mail.py", line 558, in <genexpr>
    for s, c in email.header.decode_header(header))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 1: ordinal not in range(128)

Could you let me know if I am doing something wrong or if this is a GAE bug?

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1 Answer

  1. Editorial Team

    After reading this post and this page, this seems to be the right way to do it:

    from email import header
mail.send_mail("sender@example.com", "receiver@example.com", 
               str(header.Header(u"sübject", "utf-8")), "body")

    And it is working for me so far.

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