[unisog] The Impact of Spam on your Institution

Steve VanDevender stevev at darkwing.uoregon.edu
Tue Feb 10 21:15:24 GMT 2004

William Yang writes:
 > I find the 50% metric very hard to believe: 
 > this e-mail account, which I've had for about a decade and has been 
 > actively used in USENET, on the web, and on mailing lists over the 
 > years, only gets about 15% spam by message counts.  The marginal cost 
 > for that 15%, however, is less than 1% of my operational cost.

Extrapolating merely from your own experience is dangerous here.  You
may be getting 15% spam in your email for a number of reasons that don't
apply to others -- you may get a much higher volume of legitimate mail
than they do; for whatever reason your email address has not been as
widely circulated among spammers; etc.

My experience is that the problem varies a lot among users, the users
who are being hit hard are being hit _very_ hard, and it's not getting
any better for anyone.  The 50% spam ratio is not far off from the
aggregate statistics I see on my systems in terms of number of SMTP
connections rejected by DNSBLs and local filtering compared to the
number of messages delivered.

More information about the unisog mailing list