New feature - hostname lookups in rulesets

Desai, Jason jase at
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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