def read(username, password, from_addr):
    # Login to INBOX
    imap = imaplib.IMAP4_SSL("imap.mail.ru", 993)
    imap.login(username, password)
    imap.select('INBOX')
    # Use search(), not status()
    status, response = imap.search('INBOX', '(UNSEEN)')
    unread_msg_nums = response[0].split()
    # Print the count of all unread messages
    print(len(unread_msg_nums))
    # Print all unread messages from a certain sender of interest
    status, response = imap.search(None, '(UNSEEN)',
                                   '(FROM "{}")'.format(from_addr))
    unread_msg_nums = response[0].split()
    da = []
    for e_id in unread_msg_nums:
        _, response = imap.fetch(e_id, '(UID BODY[TEXT])')
        da.append(response[0][1])
    print(da)

Traceback (most recent call last):
  File "/home/user/temp.py", line 31, in <module>
    read('my_login', ",my_passwd", 'text')
  File "/home/user/temp.py", line 23, in read
    _, response = imap.fetch(e_id, '(UID BODY[TEXT])')
  File "/usr/lib/python3.4/imaplib.py", line 474, in fetch
    typ, dat = self._simple_command(name, message_set, message_parts)
  File "/usr/lib/python3.4/imaplib.py", line 1134, in _simple_command
    return self._command_complete(name, self._command(name, *args))
  File "/usr/lib/python3.4/imaplib.py", line 965, in _command_complete
    raise self.error('%s command error: %s %s' % (name, typ, data))
imaplib.error: FETCH command error: BAD [b'[PARSE] Range parse error']