SMTPD decoding errors

[robcza]

Experiencing decoding errors on the smtp service making the trap blind to portion of the spam

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/aiosmtpd/smtp.py", line 236, in _handle_client
    command = line.upper().decode(encoding='ascii')
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc0 in position 6: ordinal not in range(128)