Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport/report.py", line 197, in _run_hook
    symb['add_info'](report, ui)
  File "/usr/share/apport/package-hooks/postfix.py", line 50, in add_info
    for k,v in extra_info.iteritems():
AttributeError: 'dict' object has no attribute 'iteritems'