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

Petri Helenius pete at
Thu Dec 4 22:36:45 UTC 2003

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 


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