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.
--
QOTD:
"I thought I saw a unicorn on the way over, but it was just a
horse with one of the horns broken off."
Eduardo M KALINOWSKI
eduardo@???
