Best SMTP/POP library?

[Skip Montanaro]

    Robert> I want to write my own email client, what is the best SMTP/POP
    Robert> library for Python 2.2? URL's please.

I don't know how you'd classify "best", but the spambayes project has a
pop3proxy.py application which works well and does a damn good job of spam
filtering to boot:

    http://spambayes.sf.net/

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