I found many problems with Openfire and TLS not with xmpp lib :( - SleekXMPP in trunk was converted to Python 3.0, and the branch is supported for Python 2.5
Unlike Julien, I would only go with Twisted Words if you really need the power of Twisted or if you already use Twisted. IMO SleekXMPP offers the closest match to the current XEP used today.
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