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Datum: Mon, 17 Jan 2011 11:13:19 +0100 (CET) Von: Maarten Bezemer mcbdovecot@robuust.nl An: Dovecot Mailing List dovecot@dovecot.org Betreff: Re: [Dovecot] SSD drives are really fast running Dovecot
On Mon, 17 Jan 2011, Steve wrote:
Spam does not bump the average mail size considerably. Average spam mails is way smaller then average normal mails. The reason for this is very simple: Spammers need to reach as many end users as possible. And they need to get those mails out as fastest as possible.
Somewhat correct. Due to a lot of spamfilter setups skip messages above a certain size, we've seen an increase of such big messages. These affect the average quite severely.
An average, however, is only just that: an average. There may not even be 1 message that has exactly the average size...
When looking at last two weeks worth of spam that didn't come from obvious blacklisted sources, I see: 45 messages below 4KB (including quite some miserable failures that forgot to include a message body...) 127 messages above 8KB, of which only 14 above 20KB 940 messages between 4KB and 8KB
Yet, the _average_ was well above 8KB, due to a few 500KB+ messages.
You get 500Kb+ sized spam messages? That is not usual. I have not done any computation on my part but I remember seen last year (or so) a study showing that spam messages are usually below 64Kb.
Anyway... Why is this so ultra important how big spam messages are?
So, mean, median, or whatever, it's just lies, damn lies, and statistics.
-- Maarten
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