[SHAME] Spam Rats

John Levine johnl at iecc.com
Thu Jan 10 20:57:25 UTC 2013

>*. PTR a.node.on.vlan344.namn.se.
>...will work just fine, for instance.

Since there is no AAAA record for a.node.on.vlan344.namn.se., this
won't work fine in any rDNS check I'm aware of.

You are aware that useful rDNS has to have matching forward DNs, right?

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