Confirmed, seeing it here as well. https://xnnd.com/dns.cgi?t=a&d=mail-eopbgr660111.outbound.protection.outlook.com.&m=yes (hit reload a couple times, you'll get different results, intermittent servfails.
Trying it this way is interesting: https://xnnd.com/dns.cgi?t=a&d=mail-eopbgr660111.outbound.protection.outlook.com&m=yeszone Querying the authoritative servers sometimes works, sometimes doesn't. I'm sure they have a big bunch of servers behind a load balancer and as noted, some are probably misconfigured. I've let various Microsoft people know. Cheers, Al Iverson Cheers, Al Iverson On Tue, Aug 24, 2021 at 2:20 PM Nitin Agarwal via mailop <[email protected]> wrote: > > We're seeing this as well. Here are some details/lookups on a sample Office > 365 ip: > https://www.misk.com/tools/#dns/40.107.66.111 > > Reverse dns is fine, forward lookup fails intermittently due to a nameserver > referral loop: > https://www.misk.com/tools/#dns/mail-eopbgr660111.outbound.protection.outlook.com > https://www.misk.com/tools/#dns/mail-eopbgr660111.outbound.protection.outlook....@ns1-gtm.glbdns.o365filtering.com > https://www.misk.com/tools/#dns/mail-eopbgr660111.outbound.protection.outlook....@ns2-gtm.glbdns.o365filtering.com > > Keep hitting refresh and you'll see the issue. Eventually, their auth servers > return an ip. Looks like one or more (but not all) of the auth dns servers in > their dns farm is misconfigured, which is why it is intermittent. > > You can also run dig multiple times from your local machine and you can see > it there as well: > dig mail-eopbgr660111.outbound.protection.outlook.com > @ns1-gtm.glbdns.o365filtering.com > dig mail-eopbgr660111.outbound.protection.outlook.com > @ns2-gtm.glbdns.o365filtering.com > > If anyone has a contact there on the right team, please forward. > > Thanks, > Nitin Agarwal > [email protected] > https://www.misk.com/ > https://www.misk.com/tools/ > > > -----Original Message----- > From: mailop <[email protected]> On Behalf Of Neil Youngman via mailop > Sent: Monday, August 23, 2021 9:16 AM > To: [email protected] > Subject: [mailop] Microsoft RDNS issues > > Is anybody else seeing issues with some Microsoft RDNS failing > intermittently. I'm seeing RDNS failures in our Exim logs, but when I check > the IPs from the command line, there are no obvious issues and it isn't > affecting all our traffic from Microsoft. > > It seems t have started a little before midnight on Friday. > > I'm not seeing anything similar with mail from Google or Messagelabs, which > is why I think it's somewhere external to us. > > Neil Youngman > Neil Youngman > Developer > > [Logo]<https://www.wirefast.com/> T: +44 (0)20 7092 8460 > E: [email protected] > W: www.wirefast.com<http://www.wirefast.com> > Wirefast Limited | 19 Bedford Row, London | WC1R 4EB. > ________________________________ > > Wirefast provides secure corporate messaging services. > See our messaging solutions at https://www.wirefast.com/ Please consider the > environment. Does this email or attachment need to be printed? > This message contains confidential information and is intended only for the > individual named. If you are not the named addressee you should not > disseminate, distribute or copy this email. Please notify the sender > immediately by email if you have received this email by mistake and delete > this email from your system. > > Any views or opinions are solely those of the author and do not necessarily > represent those of Wirefast Limited > > Email transmission cannot be guaranteed to be secure or error-free as > information could be intercepted, corrupted, lost, destroyed, arrive late or > incomplete, or contain viruses. The sender therefore does not accept > liability for any errors or omissions in the contents of this message which > arise as a result of email transmission. > > Wirefast Limited is registered in England & Wales Company number: 03865860 > Registered Office: 7/10 Chandos Street, Cavendish Square, London, W1G 9DQ > > Wirefast definitions of classification can be found here: > https://www.wirefast.com/classifications/<https://www.wirefast.com/classifications> > > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop > > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop -- Al Iverson // Wombatmail // Chicago Deliverability: https://spamresource.com DNS Tools: https://xnnd.com _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
