why IPv6 isn't ready for prime time, SMTP edition

Brielle Bruns bruns at 2mbit.com
Tue Mar 25 22:06:54 UTC 2014


On 3/25/14, 3:33 PM, Laszlo Hanyecz wrote:
> The usefulness of reverse DNS in IPv6 is dubious.  Maybe the idea is
> to cause enough pain that eventually you fold and get them to host
> your email too.


Well, like I said, there is nothing wrong with using rdns as part of a 
score in how legit a message is.  Knock off a point or two in 
Spamassassin, add a few points back because there is SPF records, and 
another one or two for DKIM...

Google is obviously doing some intelligent filtering on their end to 
handle incoming spam - why take such a drastic move against rdns when 
you already do heuristics that can factor it in without risking losing 
legit mail?


I just finished moving two customers from Google hosted mail to Office 
365 hosted Exchange.  Even with all the odd quirks and issues that 365 
has from time to time, I'm still getting better feedback from my 
customers.  So... no, I'd sooner shut down my mail services then go with 
Google mail hosting for my primary e-mail address.

But, that's just my opinion.

-- 
Brielle Bruns
The Summit Open Source Development Group
http://www.sosdg.org    /     http://www.ahbl.org



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