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List:       nanog
Subject:    RE: MSFT reverse IP failure?
From:       Jeff Mealiffe via NANOG <nanog () nanog ! org>
Date:       2018-02-28 21:11:42
Message-ID: SN6PR00MB0334B43356FAFC6FB43DB804CBC70 () SN6PR00MB0334 ! namprd00 ! prod ! outlook ! com
[Download RAW message or body]

I've escalated this to the team responsible for the tool. Will report back =
when we have some resolution.

Thanks for calling out the issue.

-----Original Message-----
From: NANOG <nanog-bounces@nanog.org> On Behalf Of Ken Chase
Sent: Monday, February 26, 2018 4:05 PM
To: Christian Kuhtz <chkuhtz@microsoft.com>
Cc: nanog@nanog.org
Subject: Re: MSFT reverse IP failure?

Im not exactly sure what this is either, the client sent me a screenshot th=
at called itself the "microsoft connectivity analyzer", which had several s=
teps testing deliverability of email to their domain, with the final test o=
f an actual test email delivery failing.

/kc


On Mon, Feb 26, 2018 at 11:25:59PM +0000, Christian Kuhtz said:
  >Ken,
  >
  >A little difficult to say what this without knowing what 13.67.59.89 act=
ually is.   If this is an Azure deployment, ReverseFqdn needs to be populat=
ed on the Public IP address resource.  Please take a look here https://docs=
.microsoft.com/en-us/azure/dns/dns-reverse-dns-for-azure-services
  >
  >Thanks,
  >Christian
  >
  >
  >-----Original Message-----
  >From: NANOG <nanog-bounces@nanog.org> On Behalf Of Ken Chase
  >Sent: Monday, February 26, 2018 1:31 PM
  >To: nanog@nanog.org
  >Subject: Re: MSFT reverse IP failure?
  >
  >Having a client doing a test from the MSFT exchange tools site, which is=
 failing.
  >
  >NOQUEUE: reject: RCPT from unknown[13.67.59.89]: 450 4.7.1 Client host r=
ejected: cannot find your reverse hostname, [13.67.59.89];
  >
  >NetRange:       13.64.0.0 - 13.107.255.255
  >CIDR:           13.96.0.0/13, 13.104.0.0/14, 13.64.0.0/11
  >NetName:        MSFT
  >
  >A bit of an oversight?
  >
  >/kc
  >--
  >Ken Chase - math@sizone.org Guelph Canada
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