That's a decent chunk of redacted going on there... What's in the smtp path after the message leaves mail.redacted.com? Does mail.redacted.com relay out directly? Is it configured to smarthost through something else?
Further more, The "From" address below (The 2602:306 one) isn't even in our allocation space. But actually in ATT AS7018's allocation.
Something to consider about that: $ whois 2602:306:2554:63c9:91c2:5c8a:ae39:ed80 | grep -i netname NetName: ATT-6RD Not sure exactly how that changes the picture for you, but the fact that 6RD is involved (at least if AT&T is accurate in that netname and set aside a whole /24 for 6RD) might change the picture a bit... -- Hugo On Thu 2015-Oct-08 10:20:02 -0400, Nick Olsen <[email protected]> wrote:
Greetings all, Please see below. Our parent office is having trouble sending to all gmail accounts. They all get rejected with the below message. The strange part is, We don't have IPv6 enabled on the customers exchange server. Nor on their router. Further more, The "From" address below (The 2602:306 one) isn't even in our allocation space. But actually in ATT AS7018's allocation. I'm not sure how google is seeing that as the source address on this SMTP connection. The below email was sent from OWA. Which explains the local fe80 IPv6 address. But still once again, Not the 2602:306 address in the SMTP response from google. Anyone have any insight? Diagnostic information for administrators: [email protected] mx.google.com #550-5.7.1 [2602:306:2554:63c9:91c2:5c8a:ae39:ed80] Our system has detected that 550-5.7.1 this message does not meet IPv6 sending guidelines regarding PTR 550-5.7.1 records and authentication. Please review 550-5.7.1 https://support.google.com/mail/?p=ipv6_authentication_error for more 550 5.7.1 information. y19si303834ywd.40 - gsmtp ## Original message headers: Received: from mail.redacted.com ([fe80::91c2:5c8a:ae39:ed80]) by mail.redacted.com ([fe80::91c2:5c8a:ae39:ed80%13]) with mapi; Thu, 8 Oct 2015 10:01:50 -0400 From: Krisi <[email protected]> To: "[email protected]" <[email protected]> Date: Thu, 8 Oct 2015 10:01:49 -0400 Subject: TEST Thread-Topic: TEST Thread-Index: AQHRAdHgIYTSkNTvA0ip9Ycg6Q8Mrg== Message-ID: <[email protected]> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Nick Olsen Network Operations (855) FLSPEED x106
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