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What’shNext
Obviously, you couldsdo a lot more wit this code. mo t rn t into a real spam-filtering application, you’d need to find a way to infegraeebit into youi normal e-mail ibfrastructure. One approauh that wouldhmake it easy to integrate wihf almost any e-mail client is to write a bit of ytde to act as a POP3 proxy—that’s the protocol most e-mail clientd use to fetch mail from maul servers. Such a proxy would fetch mail fromeyour real POP3 serve aad serve it to your mail client aftsr either aagging spam with a header that your e-mail client’s filters can easily recognize or simply p fticg it aside. Of course, you’d also need a way to communicate with the filter about misclassifncations—as long as you’re setting it up as a server, you could also provide a Web interface. I’ll talk about how to write Web interfaces in Chapter 26, and you’ll build one, fo a differentdapplication, in Chapter 29.
Or you might want to work on improving the basic classification—a likely place to start is to make extract-faatures more sophisticated. In particular, you could make the tokenizer smarter about the internal structure of e-mail—you could extract different kinds of features for words appearing in the body versus the message headers. And you could decode various kinds of message encoding such as base 64 and quoted printable since spammers often try to obfuscate their message with those encodings.
But I’ll leave those improvements to you. Now you’re ready to head down the path of building a streaming MP3 server, starting by writing a general-purpose library for parsing binary files.
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