I built mailman-bundler using the guidelines found here.

Server started successfully and and I created few domains. It worked well but when I tried to create a list, I received

HTTP Error 500: A server error occurred. Please contact the administrator.

Traceback:
Traceback (most recent call last):
  File "/usr/lib/python3.4/wsgiref/handlers.py", line 137, in run
    self.result = application(self.environ, self.start_response)
  File "github/mailman/mailman-bundler/venv-3.4/lib/python3.4/site-packages/mailman/database/transaction.py", line 57, in wrapper
    rtn = function(*args, **kws)
  File "github/mailman/mailman-bundler/venv-3.4/lib/python3.4/site-packages/mailman/rest/wsgiapp.py", line 65, in __call__
    environ, start_response)
  File "github/mailman/mailman-bundler/venv-3.4/lib/python3.4/site-packages/falcon/api.py", line 182, in __call__
    responder(req, resp, **params)
  File "github/mailman/mailman-bundler/venv-3.4/lib/python3.4/site-packages/mailman/rest/lists.py", line 206, in on_post
    mlist = create_list(**validator(request))
  File "github/mailman/mailman-bundler/venv-3.4/lib/python3.4/site-packages/mailman/app/lifecycle.py", line 81, in create_list
    call_name(config.mta.incoming).create(mlist)
  File "github/mailman/mailman-bundler/venv-3.4/lib/python3.4/site-packages/mailman/mta/postfix.py", line 69, in create
    self.regenerate()
  File "github/mailman/mailman-bundler/venv-3.4/lib/python3.4/site-packages/mailman/mta/postfix.py", line 104, in regenerate
    raise RuntimeError(NL.join(errors))
RuntimeError: command failure: /usr/sbin/postmap github/mailman/mailman-bundler/var/data/postfix_lmtp, 127, Key has expired
command failure: /usr/sbin/postmap github/mailman/mailman-bundler/var/data/postfix_domains, 127, Key has expired

Domain Details:

Mail Host: lists.example.com

URL Host: http://lists.example.com

Please Help!

Thanks

- Sonali