If I were writing an e-mail harvester, I'm sure
I'd have quite an extensive subroutine that looked
for known patterns of spam-avoidance, and how to
undo them.
Actually the best spam avoidance technique I've found is as follows:
if you can create email addresses for
a domain then
set your email address to be 'abuse(a)domain.name'
and make sure you're domain name isn't used
as a spam harbor (open relay mailer, etc)
All the spam harvesters apparently prune the name 'abuse' from their lists
as they don't want to send mail to the abuse addresses and get themselves
nailed.
--Chuck