Decode Email Headers to Unicode

gistfile1.py

# header = email.message_from_string(mail['header'])
# decoded_subject = myDecodeHeader(header["subject"])

def myDecodeHeader(subject):
  if subject is None:
    subject = ''
  else:
    subject = subject.replace("\r\n", "")
  try:
    subject = unicode(subject, 'utf-8')
  except:
    pass
  do_check = True
  while do_check:
    match = re.search(r"=\?.+?\?(Q|q|B|b)\?.+?\?=", subject)
    if match:
      s1 = subject[:match.start()]
      s3 = subject[match.end():]
      s2dh = email.Header.decode_header(match.group())[0]
      s2 = s2dh[0].replace("\t", "")
      if s2dh[1] != None:
        s2 = unicode(s2, s2dh[1])
      subject = s1 + s2 + s3
    else:
      do_check = False
  return subject