#!/usr/bin/python3

import sys

import gi
gi.require_version('GMime', '3.0')
from gi.repository import GMime
GMime.init()

stream = GMime.StreamPipe.new(sys.stdin.fileno())
parser = GMime.Parser.new_with_stream(stream)
msg = parser.construct_message()
addrs = msg.get_from()
addrs = addrs.to_string(GMime.FormatOptions(), True)
print('From:', addrs)