mbox = open('reader form submit','r')
parser = email.Parser.Parser()
msg = parser.parse(mbox)
mbox.close()

for part in msg.walk():
    print part.get('Date')
    print part.get_payload(decode=True)
    print "\n"

--------------------------------------
Output:
Date of first mail
Body of first mail
Header of second mail
Body of second mail
...