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    Last couple days for sure...  but has been going longer with
    40.92.62-63.0/24 for a couple weeks<br>
    <br>
    Which for any decent postfix MTA configuration will cause a 554.<br>
    <br>
    ><br>
    Jun 10 09:20:20 cust-mta01 postfix/smtpd[8137]: NOQUEUE: reject:
    RCPT from unknown[40.92.62.80]: 554 5.7.1 Client host rejected:
    cannot find your reverse hostname, [40.92.62.80];
    from=<a class="moz-txt-link-rfc2396E" href="mailto:user@outlook.com"><user@outlook.com></a> to=<a class="moz-txt-link-rfc2396E" href="mailto:customer@domain.com.au"><customer@domain.com.au></a>
    proto=ESMTP
    helo=<AUS01-SY4-obe.outbound.protection.outlook.com><br>
    <br>
    Mal<br>
    <br>
    <br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 11/06/2021 8:47 am, Mike Manning
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:5D207EB4DB92C34A86B2CA50AC286F4338C5CAB3@Exchange.matilda.net.au">
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        <p class="MsoNormal">Hi all,<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">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?
          <o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">host 40.92.63.85<o:p></o:p></p>
        <p class="MsoNormal">Host 85.63.92.40.in-addr.arpa. not found:
          3(NXDOMAIN)<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">host 40.92.62.31<o:p></o:p></p>
        <p class="MsoNormal">Host 31.62.92.40.in-addr.arpa. not found:
          3(NXDOMAIN)<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#00629F;mso-fareast-language:EN-AU">Mike
              Manning</span></b><span
style="font-size:13.5pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-AU"><br>
          </span><b><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:gray;mso-fareast-language:EN-AU">Network
              Engineer</span></b><span
            style="font-size:13.5pt;color:black;mso-fareast-language:EN-AU"><br>
            <br>
          </span><b><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#00629F;mso-fareast-language:EN-AU">Matilda
              Internet</span></b><span
            style="font-size:13.5pt;color:black;mso-fareast-language:EN-AU"><br>
          </span><span
style="font-size:7.5pt;font-family:"Tahoma",sans-serif;color:gray;mso-fareast-language:EN-AU">________________</span><span
style="font-size:13.5pt;color:black;mso-fareast-language:EN-AU"><br>
            <br>
          </span><span
style="font-size:7.5pt;font-family:Wingdings;color:#A18C4C;mso-fareast-language:EN-AU">(</span><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#A18C4C;mso-fareast-language:EN-AU">Telephone
            +61 7 4953 0711</span><span
style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#A18C4C;mso-fareast-language:EN-AU"><br>
          </span><span
style="font-size:7.5pt;font-family:Wingdings;color:#A18C4C;mso-fareast-language:EN-AU">(</span><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#A18C4C;mso-fareast-language:EN-AU">Fax
            +61 7 4849 5000<br>
            29 Gregory Street, Mackay, QLD 4740, Australia<br>
          </span><span
style="font-size:7.5pt;font-family:Wingdings;color:#00629F;mso-fareast-language:EN-AU">*</span><span
style="font-size:13.5pt;color:black;mso-fareast-language:EN-AU"> </span><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#00629F;mso-fareast-language:EN-AU">Email</span><span
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style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#00629F;mso-fareast-language:EN-AU"><a
              href="mailto:mike@matilda.net.au" moz-do-not-send="true"><span
                style="color:purple">mike@matilda.net.au<br>
              </span></a>Website</span><span
            style="font-size:13.5pt;color:black;mso-fareast-language:EN-AU"> <a
              href="http://www.matilda.net.au/" moz-do-not-send="true"><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:purple">www.matilda.net.au<br>
              </span></a><br>
            <br>
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        <p class="MsoNormal"><o:p> </o:p></p>
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      <pre class="moz-quote-pre" wrap="">_______________________________________________
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