On 1/15/2014 10:14 AM, Franck Martin wrote:
On Jan 15, 2014, at 10:05 AM, Darren Pilgrim <nanog@bitfreak.org <mailto:nanog@bitfreak.org>> wrote:
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 <http://gmail-smtp-in.l.google.com> [gmail-smtp-in.l.google.com <http://gmail-smtp-in.l.google.com>][2607:f8b0:4002:c01::1a] 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 https://support.google.com/mail/?p=ipv6_authentication_error [support.google.com <http://support.google.com>] for more 550 5.7.1 information. t26si2290895yhl.255 - gsmtp (in reply to end of DATA command)
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 <http://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...
https://support.google.com/mail/answer/81126?hl=en#authentication
My point was that Google told me it rejected "2607:fc50:1000:1f00::2 16". In this case, 2607:fc50:1000:1f00::2 is the correct address, but it appeared (to me) that Google's data was somehow corrupt. I'm pretty sure the IPv6 address format doesn't allow spaces. ;)