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List:       postfix-users
Subject:    Re: Google rejecting IPv6 mails
From:       Peter <peter () pajamian ! dhs ! org>
Date:       2013-10-08 10:31:21
Message-ID: 5253DEF9.6010200 () pajamian ! dhs ! org
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On 10/08/2013 11:16 PM, postfix wrote:
> Mail from our system wasn't accepted oftentimes by Google either.
> I discovered the following solution: Our mail server has got two IPv6
> addresses in the open Internet, one is specific, the other one
> automatically created. The first one was in the DNS, the second one not.
> I noticed that many times messages where sent using the automatically
> generated IPv6 address, which were the mails Google rejected.

I've had this issue before.  My solution was to turn off ipv6 autoconf
in the kernel since I do not want IPs that I do not explicitly assign.

> Since I
> introduced the automatically generated IPv6 address into the DNS, Google
> accepts all mail from our server.

To me this is a bad idea, you're working around the issue instead of
fixing the real issue which is that you're getting IPs on your server
that you didn't configure for.


Peter
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