Error while fetching emails

[tonioo]

UnicodeDecodeError at /webmail/
'charmap' codec can't decode byte 0xc1 in position 6: character maps to <undefined>

Request Method: GET
Request URL: https://mail.example.com/webmail/?action=listmailbox&mbox=INBOX&scroll=true&page=2
Django Version: 2.2.17
Python Executable: /usr/bin/uwsgi-core
Python Version: 3.6.9
Python Path: ['.', '', '/usr/lib/python36.zip', '/usr/lib/python3.6', '/usr/lib/python3.6/lib-dynload', '/srv/modoboa/env/lib/python3.6/site-packages']
Server time: Wed, 20 Jan 2021 14:51:04 +0200
Installed Applications:
('django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.sites',
 'django.contrib.staticfiles',
 'reversion',
 'ckeditor',
 'ckeditor_uploader',
 'rest_framework',
 'rest_framework.authtoken',
 'django_otp',
 'django_otp.plugins.otp_totp',
 'django_otp.plugins.otp_static',
 'modoboa',
 'modoboa.core',
 'modoboa.lib',
 'modoboa.admin',
 'modoboa.transport',
 'modoboa.relaydomains',
 'modoboa.limits',
 'modoboa.parameters',
 'modoboa.dnstools',
 'modoboa.policyd',
 'modoboa.maillog',
 'modoboa_amavis',
 'modoboa_pdfcredentials',
 'modoboa_postfix_autoreply',
 'modoboa_sievefilters',
 'modoboa_webmail',
 'modoboa_contacts',
 'webpack_loader')
Installed Middleware:
('x_forwarded_for.middleware.XForwardedForMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django_otp.middleware.OTPMiddleware',
 'modoboa.core.middleware.TwoFAMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.locale.LocaleMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'modoboa.core.middleware.LocalConfigMiddleware',
 'modoboa.lib.middleware.AjaxLoginRedirect',
 'modoboa.lib.middleware.CommonExceptionCatcher',
 'modoboa.lib.middleware.RequestCatcherMiddleware')


Traceback:

File "/srv/modoboa/env/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
  34.             response = get_response(request)

File "/srv/modoboa/env/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  115.                 response = self.process_exception_by_middleware(e, request)

File "/srv/modoboa/env/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  113.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/usr/lib/python3.6/contextlib.py" in inner
  52.                 return func(*args, **kwds)

File "/usr/lib/python3.6/contextlib.py" in inner
  52.                 return func(*args, **kwds)

File "/srv/modoboa/env/lib/python3.6/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
  21.                 return view_func(request, *args, **kwargs)

File "/srv/modoboa/env/lib/python3.6/site-packages/modoboa/admin/lib.py" in wrapped_f
  37.                 return f(request, *args, **kwargs)

File "/srv/modoboa/env/lib/python3.6/site-packages/modoboa_webmail/views.py" in index
  652.         response = globals()[action](request)

File "/srv/modoboa/env/lib/python3.6/site-packages/modoboa_webmail/views.py" in listmailbox
  401.         email_list = mbc.fetch(page.id_start, page.id_stop, mbox)

File "/srv/modoboa/env/lib/python3.6/site-packages/modoboa_webmail/lib/imaputils.py" in fetch
  748.         data = self._cmd("FETCH", mrange, query)

File "/srv/modoboa/env/lib/python3.6/site-packages/modoboa_webmail/lib/imaputils.py" in _cmd
  217.                 return FetchResponseParser().parse(data)

File "/srv/modoboa/env/lib/python3.6/site-packages/modoboa_webmail/lib/fetch_parser.py" in parse
  280.                     self.parse_chunk(schunk)

File "/srv/modoboa/env/lib/python3.6/site-packages/modoboa_webmail/lib/fetch_parser.py" in parse_chunk
  242.         chunk = self.__convert_to_str(chunk)

File "/srv/modoboa/env/lib/python3.6/site-packages/modoboa_webmail/lib/fetch_parser.py" in __convert_to_str
  236.         return chunk.decode(result["encoding"])

File "/usr/lib/python3.6/encodings/iso8859_8.py" in decode
  15.         return codecs.charmap_decode(input,errors,decoding_table)

Exception Type: UnicodeDecodeError at /webmail/
Exception Value: 'charmap' codec can't decode byte 0xc1 in position 6: character maps to <undefined>