The decode_header function does not always work correctly.
me@Serv:~$ python3
Python 3.6.5 (default, Apr 1 2018, 05:46:30)
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from email.header import decode_header
>>> s = '=?windows-1251?B?zeDp5Oj46ujtINDu7ODtIMLr4OTo7Ojw7uLo9w==?=\r\n\t<Roman@mail.ru>'
>>> decode_header(s)
[(b'\xcd\xe0\xe9\xe4\xe8\xf8\xea\xe8\xed \xd0\xee\xec\xe0\xed \xc2\xeb\xe0\xe4\xe8\xec\xe8\xf0\xee\xe2\xe8\xf7', 'windows -1251'), (b'<Roman@mail.ru>', None)]
>>> exit()
me@Serv:~$ python
Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34)
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from email.header import decode_header
>>> s = '=?windows-1251?B?zeDp5Oj46ujtINDu7ODtIMLr4OTo7Ojw7uLo9w==?=\r\n\t<Roman@mail.ru>'
>>> decode_header(s)
[('=?windows-1251?B?zeDp5Oj46ujtINDu7ODtIMLr4OTo7Ojw7uLo9w==?=\r\n\t<Roman@mail.ru>', None)]
>>> exit()
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