Chris Lewis writes on 12/4/2003 2:24 PM:
As I understand it, they blacklist if an IP with no rDNS generates "some threshold of" complaints. Not just "no rDNS" by itself.
That is a good way to go.
A simple "no rDNS" rule causes too much trouble with our overseas customers. I'm sure AOL discarded that idea for the same reason.
Yup. The model can be extended to "if no rDNS, and if spamtrap hits or other spammish behavior noted from more than X IPs per /24, then block the /24".
srs
-- srs (postmaster|suresh)@outblaze.com // gpg : EDEDEFB9 manager, outblaze.com security and antispam operations
