Errors When Sending Email To GMail Accounts

I am getting errors when I send email to gmail accounts, using my linode (email server) domain via my desktop outlook.

The error, I get for the reject looks like this…

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

danielaudet@gmail.com

host gmail-smtp-in.l.google.com [2607:f8b0:4002:c03::1a]

SMTP error from remote mail server after pipelined end of data:

550-5.7.1 [2600:3c02::f03c:91ff:fe7a:19ad] Our system has detected that this

550-5.7.1 message does not meet IPv6 sending guidelines regarding PTR records

550-5.7.1 and authentication. Please review

550-5.7.1 https://support.google.com/mail/?p=IPv6AuthError for more information

550 5.7.1 . b4si539000ybh.245 - gsmtp

Does anyone know how I can resolve this?

–Dan

1 Reply

Hey there, Dan! Taking a look at the error message, it looks like the issue is a lack of PTR record on the IPv6 address on the Linode. This also known as Reverse DNS. You can configure the RDNS for the IPv6 address here:

https://www.linode.com/docs/networking/ … everse-dns">https://www.linode.com/docs/networking/dns/configure-your-linode-for-reverse-dns

You will also want to make sure your SPF records include IPv6 if you are sending email over that. You can read more about SPF records here:

https://www.linode.com/docs/networking/ … uction#spf">https://www.linode.com/docs/networking/dns/dns-records-an-introduction#spf

I hope this helps! If there's anything else we can do, please let us know.

Regards,

Stephen Crane…

Linode Customer Support

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