<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">The IPv4 rep for the same MTA is Good.<div><br></div><div><a href="http://www.senderbase.org/lookup/?search_string=152.78.0.0/16">http://www.senderbase.org/lookup/?search_string=152.78.0.0/16</a></div><div><br></div><div>Would be interesting to see why the IPv6 rep would be different. Spam from that MTA would presumably go out over whichever protocol was available. Perhaps because there’s a much smaller sample size on IPv6 (maybe 3% of our outbound is IPv6 last time I looked) it’s more susceptible to a small amount of email that’s deemed spam.</div><div><br></div><div>Anyway, thanks :)</div><div><div>
<br class="Apple-interchange-newline"><span style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; display: inline !important; float: none;">Tim</span>
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<br><div><div>On 24 Sep 2014, at 13:41, Andrew 👽 Yourtchenko <<a href="mailto:ayourtch@gmail.com">ayourtch@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Tim,<br><br>Roger that!<br><br>We're checking internally what's going on.<br><br>Changing just one nibble in the host portion of the address makes<br>SenderBase score "neutral", so something must be up for that<br>particular /128.<br><br>When I learn more, will ping you.<br><br>--a<br><br><br>On 9/24/14, Tim Chown <<a href="mailto:tjc@ecs.soton.ac.uk">tjc@ecs.soton.ac.uk</a>> wrote:<br><blockquote type="cite">My emails to Cisco people are now bouncing.<br><br>It seems the cause is a poor rep on one of our MTAs:<br><a href="http://www.senderbase.org/lookup/?search_string=2001%3A630%3Ad0%3Af102%3A%3A25e">http://www.senderbase.org/lookup/?search_string=2001%3A630%3Ad0%3Af102%3A%3A25e</a><br>The DNS reverse seems fine for falcon.ecs.soton.ac.uk<br><br>But the email bounce (with username deleted) says:<br><br>Final-Recipient: RFC822; xxxxxxxxxx@cisco.com<br>Action: failed<br>Status: 5.1.1<br>Remote-MTA: DNS; alln-mx-01.cisco.com<br>Diagnostic-Code: SMTP; 550 Connections from the host falcon.ecs.soton.ac.uk<br>(2001:630:d0:f102::25e), originating from SenderBase Network Owner ID: None,<br>are being rejected due to a low SenderBase Reputation Score. See<br>http://www.senderbase.org for more information or contact your IT support<br>team.<br><br>If any Cisco people are on this list, please have someone have a look. I<br>think Andrew Yourtchenko is, and he is one person with bounces.<br><br>Tim<br><br><br></blockquote></blockquote></div><br></div></body></html>