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List:       postfix-users
Subject:    Re: Google rejecting IPv6 mails
From:       postfix <postfix () ayni ! com>
Date:       2013-10-08 10:16:50
Message-ID: 5253DB92.3020203 () ayni ! com
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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. Since I 
introduced the automatically generated IPv6 address into the DNS, Google 
accepts all mail from our server.

suomi

On 10/08/2013 07:46 AM, Dominik George wrote:
>>> SMTP from an address with no reverse DNS is a fairly good indicator
>>> of a spam source. YMMV.
>>
>> Agreed.
>
> As a matter of fact, I *do* have working PTR, SPF, and all that stuff,
> for both IPv4 and IPv6, and it doesn't help. I should note that I did
> have that all the time, not just after Google decided to blacklist me. I
> have tested my setup against some very restrictive mail servers, to make
> sure it is sane, and a friend and I have worked together closely to
> create waterproof and well-functioning mail systems. I am PMed in
> various chat rooms when Postfix questions come up. The reason for Google
> rejecting IPv6 mail is *not* only broken client setups. Period.
>
> Google started rejecting IPv6 mail from my nik@naturalnet.de address to
> their servers, even legitimate mail to users@jitsi.org (why an open
> source project uses Google services and *then* relay mail to their own
> mail server is a mystery to me), which is an address tuple that by all
> means should be known to Google as being legitimate.
>
> Jesus, I have worked around a lot of misconfigurations by other
> providers to allow me and my users to send mail there, the most
> prominent one being United Internet's failure to accept 8bit MIME
> messages (they were advertising 8bitmime in EHLLO, then when being hit
> by a real 8bit MIME message, they accepted it and cast it away in an
> awful attempt to prevent backscatter because some of their internal
> systems could not handle 8bit MIME). I am just tired of big companies
> that sell their services not being up to the task while virtually every
> little person out here in the community is.
>
> Paying Google customers, please help us get our mails through!
>
> Google users in general, please move away there!
>
> -nik
>
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