gmail blocking 6to4 ipv6 addresses

Does gmail universally block 6to4 addresses, or is there something else I
am doing wrong?

Jun 07 23:32:14 <a href="" title=""></a> postfix/smtp[19358]: 0695A2409C: to=<
... at gmail dot com>, orig_to=< ... at git dot icu>, relay=[2607:f8b0:400d:c08::1b]:25, delay=1.6,
delays=0.12/0.07/0.84/0.56, dsn=5.7.1, status=bounced (host[2607:f8b0:400d:c08::1b] said: 550-5.7.1
[2002:c62e:c6c6::1] Our system has detected that this message does not
550-5.7.1 meet IPv6 sending guidelines regarding PTR records and
authentication 550-5.7.1 . Please review 550-5.7.1
<a href="" title=""></a> for more information 550
5.7.1 . w38-v6si3369064qtc.330 - gsmtp (in reply to end of DATA command))

-Shawn Landden


Re: gmail blocking 6to4 ipv6 addresses

By Benny Pedersen at 06/09/2018 - 19:40

Shawn Landden skrev den 2018-06-09 05:39:
<a href="" title=""></a>

rDNS for IP 2002:c62e:c6c6::1 No record found! Failed

on the other side google make errors aswell

<a href="" title=""></a>


add PTR to your domain that matches forward ipv6, this will make google

Re: gmail blocking 6to4 ipv6 addresses

By Viktor Dukhovni at 06/08/2018 - 23:27

The fine message says (and dig confirms) that your 6to4
address [2002:c62e:c6c6::1] lacks PTR records. You might
fix that first:

; <<>> DiG 9.11.2-P1 <<>> -x 2002:c62e:c6c6::1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 22961
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

; EDNS: version: 0, flags:; udp: 8192

Re: gmail blocking 6to4 ipv6 addresses

By suomi at 06/08/2018 - 23:55

To create and operate PTR Records for a 6to4 network,
<a href="" title=""></a> may be helpful.


On 06/09/2018 06:27 AM, Viktor Dukhovni wrote: