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They have a swathe of issues on those IP's, not just reverse. Here
is a snippet of an email header from an email received on my
systems:<br>
<br>
<pre class="c-mrkdwn__pre" data-stringify-type="pre" style="box-sizing: inherit; margin: 4px 0px; padding: 8px; --saf-0:rgba(var(--sk_foreground_low,29,28,29),0.13); font-size: 12px; line-height: 1.50001; font-variant-ligatures: none; white-space: pre-wrap; overflow-wrap: break-word; word-break: normal; tab-size: 4; font-family: Monaco, Menlo, Consolas, "Courier New", monospace !important; border: 1px solid var(--saf-0); border-radius: 4px; background: rgba(var(--sk_foreground_min,29,28,29),0.04); counter-reset: list-0 0 list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; color: rgb(29, 28, 29); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">Received: from SY4AUS01FT010.eop-AUS01.prod.protection.outlook.com
(2603:10c6:10:0:cafe::45) by SYBPR01CA0024.outlook.office365.com
(2603:10c6:10::36) with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4173.22 via Frontend
Transport; Tue, 1 Jun 2021 00:35:55 +0000
X-MS-Exchange-Authentication-Results: spf=fail (sender IP is 139.130.208.5)
smtp.mailfrom=<domain name>; <domain name>; dkim=none (message not
signed) header.d=none;<domain name; dmarc=none action=none
header.from=<domain name>;</pre>
<br>
SPF failures within their systems and they have also found their way
onto the barracuda RBL for some IP's, specifically 40.92.63.28<br>
<br>
<br>
Regards<br>
Gavin Roche..<br>
<br>
<br>
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<div class="moz-cite-prefix">On 11/6/21 9:57 am, Mal wrote:<br>
</div>
<blockquote type="cite"
cite="mid:9f19f81e-0bb8-2aa4-14d5-6d273db5a180@jetlan.com">
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<br>
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"
moz-do-not-send="true"><user@outlook.com></a> to=<a
class="moz-txt-link-rfc2396E"
href="mailto:customer@domain.com.au" moz-do-not-send="true"><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
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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
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"><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
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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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If you have received this email in error please
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<p class="MsoNormal"><o:p> </o:p></p>
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