[svlug] Sudden increase in spam volume

[Rick Moen]

Quoting Kevin Smathers (kevin at ank.com):

> Just wondering if anyone else has noticed a sudden spike in low-quality 
> spam at your domains.

Some botnet has recently deployed a huge number of newly zombified IPs
on broadband, etc., and is using them to crank out both pump'n'dump
stock-fraud scammail and attempts to poison people's bayesian filters 
using nonsense text.

Manually fed bayesian filters will help.  (Turn off autolearn.)  DNSBLs
of the DUL (dial-up list) variety, ditto.  And greylisting.  And of
course rejecting non-RFC-compliant mail of all sorts (just because 
that correlates highly with spam and malwaremail, though it's your
policy call about willingness to deal with the false positives as
one-off approved exceptions).

Secondary effects such as erroneous DNSs to forged addresses are hitting
the Net heavily, too -- especially many mailing list hosts and other
forwarders.

> I would just ignore it, but it is consuming a fair amount of bandwidth....

Yours and everyone else's.  ;->