Eduardo M KALINOWSKI via Exim-users wrote:
> On 22/06/2022 11:14, 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.
>
> For starters, I guess you need a reverse DNS (PTR record) for that
> sending host (2603:3001:600:4a00::8a4d). Your SPF configuration should
> also list it as a valid sender.
>
> Or you could deliver only with IPv4. This can be done with an
> "interface = " in your transport.
>
That's what I think I'm doing. I do not have any IPv6 records so no IPv6
address should be included. I'll check the transport to see if it has
the correct entry, my server does have local IPv6 address, perhaps
that's being communicated. Please see the previous response where it is
suggested that IPv6 is required.
--
Robert Steinmetz, AIA
Principal
Steinmetz & Associates
