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comcast ipv6 PTR

Subject: comcast ipv6 PTR
From: fmartin at linkedin.com (Franck Martin)
Date: Tue, 15 Oct 2013 01:23:09 +0000
In-reply-to: <[email protected]>
References: <[email protected]> <CE82582B.3312E%[email protected]> <[email protected]>

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...

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Follow-Ups:
- comcast ipv6 PTR
  - From: fergdawgster at mykolab.com (Paul Ferguson)
- comcast ipv6 PTR
  - From: bzs at world.std.com (Barry Shein)

References:
- comcast ipv6 PTR
  - From: bzs at world.std.com (Barry Shein)
- comcast ipv6 PTR
  - From: Lee at asgard.org (Lee Howard)
- comcast ipv6 PTR
  - From: bzs at world.std.com (Barry Shein)

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