New feature - hostname lookups in rulesets
jase at sensis.com
Fri Jun 5 16:52:41 IST 2009
> Do you do any checking of the host name? For example, it would be
> trivial for someone who controls DNS for a range of IPs to set their
> PTR records to whatever they wish. To make it a little more difficult
> to abuse, I'd suggest doing an A lookup and verifying that the IP of
> the name matches the IP that the mail came from. It will require a
> more lookups and logic, but I would think it's worth it. Of course,
> not all domains have matching PTR and A records. Maybe make this
> additional check optional? I just don't want to see this get abused.
Never mind. Looks like you've already done something like this. I
should finish catching up on the list before replying ...
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