Here's an odd question. Do you use Google Public DNS or your own resolvers? I was indeed running into random, unexpected rDNS failures using Google Public DNS 8.8.8.8/8.8.4.4 yesterday. I haven't poked at it again today to see if it's still happening.
In my case it wasn't Microsoft specific, but it was indeed rDNS resolution for my Postfix install for inbound mail handling. Cheers, Al On Mon, Aug 23, 2021 at 11:34 AM Neil Youngman via mailop <mailop@mailop.org> wrote: > > 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 -- 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
