Public bug reported: Hello, I installed Mailman 3 and Postorius on CentOS 7, via the packages available at this repo: https://repos.fedorapeople.org/repos/abompard/hyperkitty/el-7/x86_64/ I am using the default Postorius configuration. I am running Postorius using the provided development Django project from bzr. I have configured a domain that isn't real and a test list. Mailman has access to an outgoing MTA but the MTA can't send mail back via LMTP, at least at the moment. I encountered an error when I attempted to change the test list's settings for Message Acceptance. When I try to save my change in settings, for any setting on that page, I get an error. I was able to successfully change settings on that page (setting default_member_action to "accept", specifically) by using the Python REST client. I directly changed the value and ran .save() and everything looked correct and there were no errors. This is the error in the Postorius log: [20/May/2015 19:59:35] "POST /postorius/lists/testlist.mail.local/settings/message_acceptance HTTP/1.1" 500 78853 This is the output from mailman.log: May 20 20:59:35 2015 (12584) 127.0.0.1 - - "PATCH /3.0/lists/testlist@mail.local/config HTTP/1.1" 400 2 Here is the trace output from the error: ******* Environment: Request Method: POST Request URL: http://127.0.0.1:8000/postorius/lists/testlist.mail.local/settings/message_a... Django Version: 1.6.11 Python Version: 2.7.5 Installed Applications: ('django.contrib.auth', 'django.contrib.messages', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'django.contrib.admin', 'django.contrib.staticfiles', 'postorius', 'django_browserid') Installed Middleware: ('django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.locale.LocaleMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware') Traceback: File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response 112. response = wrapped_callback(request, *callback_args, **callback_kwargs) File "/usr/lib/python2.7/site-packages/postorius/auth/decorators.py" in wrapper 58. return fn(*args, **kwargs) File "/usr/lib/python2.7/site-packages/postorius/views/list.py" in list_settings 787. except HTTPError as e: Exception Type: UnboundLocalError at /postorius/lists/testlist.mail.local/settings/message_acceptance Exception Value: local variable 'HTTPError' referenced before assignment ********* Let me know what other information you need, or how I can help diagnose this issue. ** Affects: postorius Importance: Undecided Status: New -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to Postorius. https://bugs.launchpad.net/bugs/1457271 Title: HTTP 500 error when saving changes to Message Acceptance settings To manage notifications about this bug go to: https://bugs.launchpad.net/postorius/+bug/1457271/+subscriptions