Re: AOL rejecting mail from IP's w/o reverse DNS ?

[Petri Helenius]

Suresh Ramasubramanian wrote:

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".

And why would blocking the /24 be appropriate instead of matching the 
registry?

Pete