Microsoft people thanked me for the notification and it sounded as though they are going to look into it. I don't have any sort of ETA for a fix.
Cheers, Al Iverson On Tue, Aug 24, 2021 at 3:38 PM Al Iverson <aiver...@wombatmail.com> wrote: > > 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 > <mailop@mailop.org> 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 > > nagar...@misk.com > > https://www.misk.com/ > > https://www.misk.com/tools/ > > > > > > -----Original Message----- > > From: mailop <mailop-boun...@mailop.org> On Behalf Of Neil Youngman via > > mailop > > Sent: Monday, August 23, 2021 9:16 AM > > To: mailop@mailop.org > > 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: neil.young...@wirefast.com > > 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 > > mailop@mailop.org > > https://list.mailop.org/listinfo/mailop > > > > _______________________________________________ > > mailop mailing list > > mailop@mailop.org > > https://list.mailop.org/listinfo/mailop > > > > -- > Al Iverson // Wombatmail // Chicago > Deliverability: https://spamresource.com > DNS Tools: https://xnnd.com -- Al Iverson // Wombatmail // Chicago Deliverability: https://spamresource.com DNS Tools: https://xnnd.com _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
