[Bug 1425359] Re: 500 error code shown by postorius instead of 409 error code

** Tags added: postorius -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/1425359 Title: 500 error code shown by postorius instead of 409 error code To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/1425359/+subscriptions