If you do email over IPv6, all your emails must be authenticated (SPF or DKIM) and with a sending IP with a rDNS entry (M3AAWG recommendation implemented by the big emailers). Otherwise you will feel the pain very quickly. See other thread on gov't MX records.
On Thu, Oct 8, 2015 at 9:36 AM, Frank Bulk <[email protected]> wrote: > Interesting you mention that. Yesterday, for the first time, a part-time > IT consultant (who serves customers in our area) asked about PTRs as some > of his clients (who are now getting an IPv6 address from us) are having > email delivery issues to Gmail.. Our IPv6 rollout is starting to get > noticed! > > > > Frank > > > > *From:* mailop [mailto:[email protected]] *On Behalf Of *Nick > Olsen > *Sent:* Thursday, October 08, 2015 10:14 AM > *To:* Hugo Slabbert <[email protected]> > > *Cc:* [email protected] > *Subject:* Re: [mailop] Strange Gmail IPv6 rejects? > > > > Hugo, Thanks for the reply. > > > > This one's solved. > > > There's an ATT DSL modem on-site that is used for OOB. Someone had > interfaced it with the internal switch. And the server got an IPv6 auto > discovery address. So it Really had an IPv6 address. And it really was > sending mail outbound with it. What is it, Monday? > > > > Nick Olsen > Network Operations > > (855) FLSPEED x106 > > > ------------------------------ > > *From*: "Hugo Slabbert" <[email protected]> > *Sent*: Thursday, October 08, 2015 11:11 AM > *To*: "Nick Olsen" <[email protected]> > *Cc*: [email protected] > *Subject*: Re: [mailop] Strange Gmail IPv6 rejects? > > > > 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 > > > > > > > > _______________________________________________ > mailop mailing list > [email protected] > http://chilli.nosignal.org/mailman/listinfo/mailop > >
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