SilentGhost added the comment:

This is the mailer daemon response when trying to post a review on Rietveld 
with comments from Ralf Hildebrant. I've left only one error, but they're all 
nearly identical bar google's host and IP.

> Hi,
>
> Below is the automatic reply I got when attempting to send a Rietvel review.
> They seem to not like IPv6 PTR records and authentication.

I'm intrigued, since psf.upfronthosting.co.za. doesn't seem to have an
AAAA record at all

$ host -t AAAA psf.upfronthosting.co.za
psf.upfronthosting.co.za has no AAAA record

Yet it seems to have IPv6 connectivity (which takes precedence for
connections)

A solution could be:

* enter AAAA and reverse records
or
* disable ipv6 for email delivery

Unfortunately I'm not the admin for psf.upfronthosting.co.za

>
> Cheers,
> SilentGhost
>
> ----- Start Forwarded Message -----
> Sent: Thu, 31 Mar 2016 21:15:08 +0200 (CEST)
> From: mailer-dae...@psf.upfronthosting.co.za (Mail Delivery System)
> To: ghost.adh
> Subject: Undelivered Mail Returned to Sender
>
> This is the mail system at host psf.upfronthosting.co.za.
>
> I'm sorry to have to inform you that your message could not
> be delivered to one or more recipients. It's attached below.
>
> For further assistance, please send mail to postmaster.
>
> If you do so, please include this problem report. You can
> delete your own text from the attached returned message.
>
>                    The mail system
>
> <pala...@gmail.com>: host gmail-smtp-in.l.google.com[2a00:1450:400c:c02::1b]
>     said: 550-5.7.1 [2a01:4f8:131:2480::3] Our system has detected that this
>     message does 550-5.7.1 not meet IPv6 sending guidelines regarding PTR
>     records and 550-5.7.1 authentication. Please review 550-5.7.1
>     https://support.google.com/mail/?p=ipv6_authentication_error for more
> 550
>     5.7.1 information. bj8si10122183wjc.170 - gsmtp (in reply to end of DATA
>     command)
>

----------
nosy: +SilentGhost

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