Re: [mailop] Microsoft PTR record(s) missing

[Gellner, Oliver via mailop]

I hope Outlook does not completley mess up this message, otherwise please bear 
with me since I'm forced to use it.

> As a heads up to any of our Microsoft contacts, and to anyone else who may 
> see their own filters hitting this today,
> there appears to be missing PTR records over on the MS side again right now. 
> Most specifically, the IP 40.107.236.10
> called it into question on our side. The IP would send it's HELO as 
> NAM11-BN8-obe.outbound.protection.outlook.com,
> which resolves to 23.103.198.239, and while 40.107.236.10 has no PTR at all.

Unfortunately it's not only right now, but has been like this since I can 
remember. Examples of Microsoft servers with broken DNS setup from this week:

40.93.12.0 resolves to mail-eus2azlp1701.outbound.protection.outlook.com.
40.93.12.3 resolves to mail-eus2azlp17010003.outbound.protection.outlook.com.
40.93.12.4 resolves to mail-eus2azlp17010004.outbound.protection.outlook.com.
40.93.12.8 resolves to mail-eus2azlp17010008.outbound.protection.outlook.com.
52.101.56.14 resolves to mail-eus2azon11020014.outbound.protection.outlook.com.
52.101.56.15 resolves to mail-eus2azon11020015.outbound.protection.outlook.com.
52.101.56.16 resolves to mail-eus2azon11020016.outbound.protection.outlook.com.
52.101.56.17 resolves to mail-eus2azon11020017.outbound.protection.outlook.com.
52.101.56.18 resolves to mail-eus2azon11020018.outbound.protection.outlook.com.
52.101.56.19 resolves to mail-eus2azon11020019.outbound.protection.outlook.com.
52.101.56.20 resolves to mail-eus2azon11020020.outbound.protection.outlook.com.
52.101.56.21 resolves to mail-eus2azon11020021.outbound.protection.outlook.com.
52.101.56.22 resolves to mail-eus2azon11020022.outbound.protection.outlook.com.
52.101.56.23 resolves to mail-eus2azon11020023.outbound.protection.outlook.com.
52.101.56.24 resolves to mail-eus2azon11020024.outbound.protection.outlook.com.
52.101.56.27 resolves to mail-eus2azon11020027.outbound.protection.outlook.com.
52.102.138.5 resolves to mail-eus2azhn15010005.outbound.protection.outlook.com.

The A records all resolve back to 127.0.0.1...
Their HELO hostnames are again completely different and neither match the IP 
nor the A record.

Best regards
Oliver
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[mailop] Microsoft PTR record(s) missing

[Jarland Donnell via mailop]

As a heads up to any of our Microsoft contacts, and to anyone else who 
may see their own filters hitting this today, there appears to be 
missing PTR records over on the MS side again right now. Most 
specifically, the IP 40.107.236.10 called it into question on our side. 
The IP would send it's HELO as 
NAM11-BN8-obe.outbound.protection.outlook.com, which resolves to 
23.103.198.239, and while 40.107.236.10 has no PTR at all.


jarlanddonnell@jarlands-mbp ~ % host 40.107.236.10
Host 10.236.107.40.in-addr.arpa. not found: 3(NXDOMAIN)
jarlanddonnell@jarlands-mbp ~ % host 
NAM11-BN8-obe.outbound.protection.outlook.com

NAM11-BN8-obe.outbound.protection.outlook.com has address 23.103.198.239
NAM11-BN8-obe.outbound.protection.outlook.com has IPv6 address 
2a01:111:f400:7eae::200


So if you haven't already heard from customers about this, may want to 
be on the lookout that you're not missing important emails.

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