comcast ipv6 PTR

Tue Oct 15 01:36:53 UTC 2013

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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