gmail.com - 550 error for ipv6/PTR ?

Wed Jan 15 22:18:25 UTC 2014

On Wed, Jan 15, 2014 at 12:05 PM, Darren Pilgrim <nanog at bitfreak.org> wrote:

> host gmail-smtp-in.l.google.com[2607:f8b0:4002:c01::1a] said: 550-5.7.1
> [2607:fc50:1000:1f00::2      16] Our system has detected that this
> 550-5.7.1 message does not meet IPv6 sending guidelines...
>

I could not reproduce the error during a telnet test.
However, I see a substantial number of outgoing  550 5.7.1  rejects  that
look just like that,  mixed in with accepted mail to gmail.com.
So it would appear to be transient, but ongoing.

And more than a bit troublesome, since it is shown as a 550 reject,  and
delivery therefore will not be deferred and retried appropriately.

Jan 15 15:41:29  [...] Failed "Site gmail.com (2607:f8b0:4002:c01::1a) said
after data sent: 550 5.7.1 more information. q48si1281225yhb.127 - gsmtp
550-5.7.1 [2607:f360:0:1f0::40:2f00      12] Our system has detected that
this"

-- 
-JH