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Even after throttling down to one message per second, after about 20 messages GTalk starts bouncing XMPP messages with ...

<error type="cancel" code="503"><service-unavailable xmlns="urn:ietf:params:xml:ns:xmpp-stanzas" /></error>

What is the maximum send rate for XMPP messages through Google Talk?

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Empirically a delay of a few seconds when sending after about 10 messages appears to allow continuous sending but I'd still like to know a more accurate answer. Closing for now unless someone knows better.

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i too experienced throttling from talk.google.com, but i can't find any documentation on it. The client from within gmail doesn't seem to have that same restriction. I was able to do paste and enter quickly to simulate it.

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