mention where it came from

tools/write-mime-multipart

@@ -1,4 +1,6 @@
 #!/usr/bin/python
+# largely taken from python examples
+# http://docs.python.org/library/email-examples.html
 
 """Send the contents of a directory as a MIME message."""
 
@@ -8,8 +10,6 @@ import smtplib
 # For guessing MIME type based on file name extension
 import mimetypes
 
-from optparse import OptionParser
-
 from email import encoders
 from email.message import Message
 from email.mime.base import MIMEBase