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exchange mail only with trusted servers, then lack of authentication is clearly a problem warranting an error message; but for a general-purpose client, it probably merits a warning instead. Listing 13 5 acts as a TLS-capable general-purpose client. It will connect to a server and use TLS if it can; otherwise, it will fall back and send the message as usual. (But it will die with an error if the attempt to start TLS fails while talking to an ostensibly capable server!) Listing 13 5. Using TLS Opportunistically #!/usr/bin/env python # SMTP transmission with TLS - 13 - tls.py import sys, smtplib, socket if len(sys.argv) < 4: print "Syntax: %s server fromaddr toaddr [toaddr...]" % sys.argv[0] sys.exit(2) server, fromaddr, toaddrs = sys.argv[1], sys.argv[2], sys.argv[3:] message = """To: %s From: %s Subject: Test Message from simple.py Hello, This is a test message sent to you from the tls.py program in Foundations of Python Network Programming. """ % (', '.join(toaddrs), fromaddr) try: s = smtplib.SMTP(server) code = s.ehlo()[0] uses_esmtp = (200 <= code <= 299) if not uses_esmtp: code = s.helo()[0] if not (200 <= code <= 299): print "Remove server refused HELO; code:", code sys.exit(1) if uses_esmtp and s.has_extn('starttls'): print "Negotiating TLS...." s.starttls() code = s.ehlo()[0] if not (200 <= code <= 299): print "Couldn't EHLO after STARTTLS" sys.exit(5) print "Using TLS connection." else: print "Server does not support TLS; using normal connection." s.sendmail(fromaddr, toaddrs, message) except (socket.gaierror, socket.error, socket.herror, smtplib.SMTPException), e: print " *** Your message may not have been sent!" print e sys.exit(1)

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Once you click the button, the Save As dialog box appears (see Figure 10-10). Enter MyTechnoratiBlock as the name project. You can also add a description for other people to see and a tag that will be used to help others search for your block. Click the Accept and Save button to save your block. Once you return to the Block Creator, you should be able to see your block under the My Blocks section of the Block window (you might have to refresh your browser); see Figure 10-11. Now that your block has been added to the Popfly environment, you are ready to use it in your mashups. If you are not in the Block Creator, you can find your block in your Projects list by selecting My Stuff Projects from the main menu. When the Projects list appears, your block will be at the top of the list (see Figure 10-12).

else: print "Message successfully sent to %d recipient(s)" % len(toaddrs) If you run this program and give it a server that understands TLS, the output will look like this: $ ./tls.py localhost jgoerzen@complete.org jgoerzen@complete.org Negotiating TLS.... Using TLS connection. Message successfully sent to 1 recipient(s) Notice that the call to sendmail() in these last few listings is the same, regardless of whether TLS is used. Once TLS is started, the system hides that layer of complexity from you, so you do not need to worry about it. Please note that this TLS example is not fully secure, because it does not perform certificate validation; again, see 6 for details.

Adds the two operands. Subtracts the second operand from the first. Multiplies the two operands. Divides the first operand by the second. Integer division rounds the result toward 0 to the nearest integer.

Finally, we reach the topic of Authenticated SMTP, where your ISP, university, or company e-mail server needs you to log in with a username and password to prove that you are not a spammer before they allow you to send e-mail. For maximum security, TLS should be used in conjunction with authentication; otherwise your password (and username, for that matter) will be visible to anyone observing the connection. The proper way to do this is to establish the TLS connection first, and then send your authentication information only over the encrypted communications channel. But using authentication itself is simple; smtplib provides a login() function that takes a username and a password. Listing 13 6 shows an example. To avoid repeating code already shown in previous listings, this listing does not take the advice of the previous paragraph, and sends the username and password over an un-authenticated connection that will send them in the clear. Listing 13 6. Authenticating over SMTP #!/usr/bin/env python # SMTP transmission with authentication - 13 - login.py import sys, smtplib, socket from getpass import getpass if len(sys.argv) < 4: print "Syntax: %s server fromaddr toaddr [toaddr...]" % sys.argv[0] sys.exit(2) server, fromaddr, toaddrs = sys.argv[1], sys.argv[2], sys.argv[3:] message = """To: %s From: %s Subject: Test Message from simple.py Hello, This is a test message sent to you from the login.py program in Foundations of Python Network Programming. """ % (', '.join(toaddrs), fromaddr) sys.stdout.write("Enter username: ")

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