root@mail:/home/ubuntu/mailinabox/management# ./status_checks.py

System
======
✖  Public DNS (nsd4) is running and available over IPv4 but is not accessible over IPv6 at 2620:89:2000::10 port 53.
✖  The SSH server on this machine permits password-based login. A more secure way to log in is using a public key. Add your SSH public key to $HOME/.ssh/authorized_keys, check that you can log in without a
   password, set the option 'PasswordAuthentication no' in /etc/ssh/sshd_config, and then restart the openssh via 'sudo service ssh restart'.
✓  System software is up to date.
?  You are running version Mail-in-a-Box v0.47. Mail-in-a-Box version check disabled by privacy setting.
✓  System administrator address exists as a mail alias. [administrator@mail.xxx.net ↦ xxx@xxx.com,noc@xxx.net]
✓  The disk has 70.18 GB space remaining.
✓  System memory is 89% free.

Network
=======
✓  Firewall is active.
✓  Outbound mail (SMTP port 25) is not blocked.
✓  IP address is not blacklisted by zen.spamhaus.org.
multiprocessing.pool.RemoteTraceback:
"""
Traceback (most recent call last):
  File "/usr/lib/python3.6/multiprocessing/pool.py", line 119, in worker
    result = (True, func(*args, **kwds))
  File "/usr/lib/python3.6/multiprocessing/pool.py", line 47, in starmapstar
    return list(itertools.starmap(args[0], args[1]))
  File "./status_checks.py", line 349, in run_domain_checks_on_domain
    check_mail_domain(domain, env, output)
  File "./status_checks.py", line 587, in check_mail_domain
    mxhost = mx.split('; ')[0].split(' ')[1]
IndexError: list index out of range
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "./status_checks.py", line 976, in <module>
    run_checks(False, env, ConsoleOutput(), pool)
  File "./status_checks.py", line 64, in run_checks
    run_domain_checks(rounded_values, env, output, pool)
  File "./status_checks.py", line 322, in run_domain_checks
    ret = pool.starmap(run_domain_checks_on_domain, args, chunksize=1)
  File "/usr/lib/python3.6/multiprocessing/pool.py", line 274, in starmap
    return self._map_async(func, iterable, starmapstar, chunksize).get()
  File "/usr/lib/python3.6/multiprocessing/pool.py", line 644, in get
    raise self._value
IndexError: list index out of range
root@mail:/home/ubuntu/mailinabox/management#