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CHAPTER 13 SMTP
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job of writing a full mail transfer agent (MTA), as the RFCs call an e-mail server, and give it a full standards-compliant re-try queue. This is not only a big job, but also one that has already been done well several times, and you will be wise to take advantage of one of the existing MTAs (look at postfix, exim, and qmail) before trying to write something of your own. So only rarely will you be making SMTP connections out into the world from Python. More usually, your system administrator will tell you one of two things: That you should make an authenticated SMTP connection to an existing e-mail server, using a username and password that will belong to your application, and give it permission to use the e-mail server to queue outgoing messages That you should run a local binary on the system like the sendmail program that the system administrator has already gone to the trouble to configure so that local programs can send mail
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As of late 2010, the Python Library FAQ has sample code for invoking a sendmail compatible program; take a look at the section How do I send mail from a Python script on the following page: http://docs.python.org/faq/library.html Since this book is about networking, we will not cover this possibility in detail, but you should remember to do raw SMTP yourself only when no simpler mechanism exists on your machine for sending e-mail.
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The key concept involved in SMTP that consistently confuses beginners is that the addressee headers you are so familiar with To, Cc (carbon copy), and Bcc (blind carbon copy) are not consulted by the SMTP protocol to decide where your e-mail goes! This surprises many users. After all, almost every e-mail program in existence asks you to fill in those addressee fields, and when you hit Send, the message wings it way out to those mailboxes. What could be more natural But it turns out that this is a feature of the e-mail client itself, not of the SMTP protocol: the protocol knows only that each message has an envelope around it naming a sender and some recipients. SMTP itself does not care whether those names are ones that it can find in the headers of the message. That e-mail must work this way will actually be quite obvious if you think for a moment about the Bcc blind carbon-copy header. Unlike the To and Cc headers, which make it to the e-mail s destination and let each recipient see who else was sent that e-mail, the Bcc header names people who you want to receive the mail without any of the other recipients knowing. Blind copies let you quietly bring a message to someone s attention without alerting the other readers of the e-mail. The existence of a header like Bcc that can be present when you compose a message but disappear as it is sent raises two points: Your e-mail client edits your message s headers before sending it. Besides removing the Bcc header so that none of the e-mail's recipients gets a copy of it, the client typically adds headers as well, such as a unique message ID, and perhaps the name of the e-mail client itself (an e-mail open on my desktop right now, for example, identifies the X-Mailer that sent it as YahooMailClassic ). An e-mail can pass across SMTP toward a destination address that is mentioned nowhere in the e-mail headers or text itself and can do this for the most legitimate of reasons.
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CHAPTER 13 SMTP
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This mechanism also helps support mailing lists, so that an e-mail whose To says advocacy@python.org can actually be delivered, without rewritten headers, to the dozens or hundreds of people who subscribe to that list. So, as you read the following descriptions of SMTP, keep reminding yourself that the headers-plusbody that make up the e-mail message itself are separate from the envelope sender and envelope recipient that will be mentioned in the protocol descriptions. Yes, it is true that your e-mail client, whether you are using /usr/sbin/sendmail or Thunderbird or Google Mail, probably asked you for the recipient s e-mail address only once; but it then proceeded to use it in two different places, once in the To header at the top of the message, and then again outside of the message when it spoke SMTP in order to send the e-mail on its way.
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