ref: 4bb9e229bcb23826a0fde907667c8fd6565d98d2
dir: /sys/lib/python/email/test/data/msg_31.txt/
From: aperson@dom.ain MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=BOUNDARY_ --BOUNDARY Content-Type: text/plain message 1 --BOUNDARY Content-Type: text/plain message 2 --BOUNDARY--