Parse and Dump MIME Message

decode-mime.py

from email import message_from_file
import sys

def dump_content(message) -> bytes:
  
  if message.is_multipart():
    return b"\n".join([dump_content(m) for m in message.get_payload()])
  else:
    return message.get_payload(decode=True)

with open(sys.argv[1], "r") as filp:
  message = message_from_file(filp)
  
  print(dump_content(message).decode("utf-8"))