[AusNOG] Microsoft missing RDNS

Mike Manning mike at matilda.net.au
Fri Jun 11 09:17:32 EST 2021

Hi all,

Anyone else here experiencing missing RDNS for a swath of IP's from Microsoft on a few different subnets? I've opened a ticket with Microsoft netops for it and I've done an rDNS bypass on our local antispam filter however we're now seeing o365 clients with the same issue when trying to receive emails from anyone with an @outlook.com or @msn.com email address.. where do you draw the line in adding bypass after bypass?

Host not found: 3(NXDOMAIN)

Host not found: 3(NXDOMAIN)

Mike Manning
Network Engineer

Matilda Internet

*Telephone +61 7 4953 0711
*Fax +61 7 4849 5000
29 Gregory Street, Mackay, QLD 4740, Australia
* Email mike at matilda.net.au
<mailto:mike at matilda.net.au>Website www.matilda.net.au

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