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I'm wondering if someone is publishing statistics on email usage on the internet.

The main number I'm looking for is average message size on a large scale sample data over time.

If someone doing spam/security checks is accumulating this data and publishing it I'd like to know.

Barracuda, Trend, Symantec, SpamCop, etc.

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You can get a lot of info like that from Cisco's Senderbase

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Thanks for the link, although it is not quite what I'm looking for. I'd like more aggregated statistics about the messages themselves, this is more about the senders. – ManiacZX Jan 18 '11 at 19:23

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