AOL rejecting mail from IP's w/o reverse DNS ?
suresh at outblaze.com
Thu Dec 4 22:41:55 UTC 2003
Petri Helenius writes on 12/4/2003 5:36 PM:
>> 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
I would refer you to the huge number of netblocks out there that stay at
/16 or larger size, with the upstream not SWIP'ing or otherwise
delegating netblocks in APNIC (or wherever, such as an rwhois server) as
they provision IPs.
srs (postmaster|suresh)@outblaze.com // gpg : EDEDEFB9
manager, outblaze.com security and antispam operations
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