On Wed, 22 Jun 2022, Robert Steinmetz via Exim-users wrote:
> I'm getting some messages bounced from google with the following message
>
>> host aspmx.l.google.com [2607:f8b0:4002:c08::1a]
>> SMTP error from remote mail server after pipelined end of data:
>> 550-5.7.1 [2603:3001:600:4a00::8a4d] Our system has detected that this
>> message
>> 550-5.7.1 does not meet IPv6 sending guidelines regarding PTR records
>> and
>> 550-5.7.1 authentication. Please review
>> 550-5.7.1https://support.google.com/mail/?p=IPv6AuthError for more
>> information
>> 550 5.7.1 . bd16-20020a05690c011000b00317b6ac906asi14707597ywb.433 -
>> gsmtp
>
> There are no IPv6 records set up and I've gone through with my ISP (Comcast)
> to check the PTR records. The odd thing is that this only seems to affect
> some users and usually those that have their own domain. Standard gmail.com
> accounts seem unaffected.
>
> I'd appreciate any tips on trouble shooting this problem.
Do the affected users have IPv6 in their domains ?
Do their domains *only* have IPv6 ?
https://support.google.com/mail/?p=IPv6AuthError
redirects my browser to
https://support.google.com/mail/answer/81126?visit_id=637915049167321565-1683936288&p=IPv6AuthError&rd=1#authentication
at the bottom of which is the text
Fix IPv6 authorization errors
An IPv6 authorization error could mean the PTR record for the sending
server isn’t using IPv6. If you use an email service provider, confirm
they’re using an IPv6 PTR record.
Here's an example of an IPv6 authorization error:
550-5.7.1: Message does not meet IPv6 sending guidelines regarding PTR
records and authentication.
As I read this, you are the email service provider,
so google are saying that you *need* IPv6.
This is not really an exim issue; you might have more
informed replies if you (subscribe to and) ask on
https://list.mailop.org/listinfo/mailop
--
Andrew C. Aitchison Kendal, UK
andrew@???
