Re: comcast ipv6 PTR

[Paul Ferguson <fergdawgster () mykolab com>]

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On 10/14/2013 6:23 PM, Franck Martin wrote:

> If you want to block spam on IPv6, then you can start by rejecting
> connections to SMTP from any IPv6 that do not have a PTR. No need to
> analyze the format of the PTR.
>
> It is in several recommendations that a sending email IP must have a PTR.
>
> That ISPs will not do a PTR on all IPv6 but only on static IPv6, improves
> the spam blocking feature above. No need to maintain list of dynamic IP
> space...
>

...and Franck would know -- he rejects all mail from MTAs which do not. :-)

- - ferg


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--
Paul Ferguson
Vice President, Threat Intelligence
Internet Identity, Tacoma, Washington  USA
IID --> "Connect and Collaborate" --> www.internetidentity.com