Someone

#!/usr/bin/python
#
# Save this to a file, chmod +x it, then do:
# ./file.py | /usr/sbin/sendmail your@yourdomain.com
# On a postfix box the email will come through corrupted with
# the header line in the body. On a sendmail box it won't.

print "X-test-header: tessier's test header.\r\n"
print "\r\n"
print "This is the body.\r\n"