ISPs blocking SMTP connections from dynamic IP address space

Steve Hovey shovey at
Wed Aug 6 10:00:30 PDT 2003

> We started blocking on no rDNS several months ago, and it's been extremely
> effective with low false positive problems.  I heard that AOL started
> refusing connections with no rDNS about a month ago which makes it easier
> to justify our policies to the clueless.

Yah - I waited for a month or so after AOL started - figuring they get so
much email that valid but badly done sites would have gotten with the
program by now.

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