[unisog] The Impact of Spam on your Institution

Joseph Brennan brennan at columbia.edu
Fri Feb 13 16:20:14 GMT 2004

> I have seen "expert" estimates ranging from 25% to 70%.

That ratio depends on how much non-spam you get, so it should vary
tremendously between sites, depending on how they use mail.  This
ratio suggests what an average user sees in the inbox, but does not
measure how much is being thrown at them.

Another ratio would be spam messages per valid address.

Another would be spam messages per top victims.  We have some users
whose addresses have got into the hands of people who must be selling
addresses to each other (like the famous Nadine), and those folks get
much more spam than other people.  They are the ones who might decide
it is worth the trouble of abandoning their address for a new one.
That is just sad.

Joseph Brennan
Academic Technologies Group, Academic Information Systems (AcIS)
Columbia University in the City of New York

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