gmail.com - 550 error for ipv6/PTR ?
nanog at bitfreak.org
Wed Jan 15 18:05:50 UTC 2014
On 1/14/2014 4:06 PM, Brandon Applegate wrote:
> Just saw this in a message tonight. No idea if this is a transient error
> or not.
> host gmail-smtp-in.l.google.com
> said: 550-5.7.1 [2607:ff70:11::11] 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
> [support.google.com] for more 550
> 5.7.1 information. t26si2290895yhl.255 - gsmtp (in reply to end of DATA
I saw a number of these as well but in my case the bracketed IP
addresses were malformed. For example:
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...
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