The Schulte RBL
I decided to publish via DNS this list of IP addresses I don’t want to get
mail from. That way I could export it easily to my multiple SMTP servers via zone
transfer or direct DNS lookup, and not have to maintain multiple access maps
manually or via something like rsync.
I generally add /24 or /16 catch all entries when repeated spam comes from
a /24 or /16 and I don’t foresee any legitimate email coming from these