On 24 Sep 2014, at 18:07, Andrew 👽 Yourtchenko <[email protected]> wrote:
> On 9/24/14, Tim Chown <[email protected]> wrote: >> The IPv4 rep for the same MTA is Good. >> >> http://www.senderbase.org/lookup/?search_string=152.78.0.0/16 >> >> 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. >> >> Anyway, thanks :) >> > > np, looks like you should have something in your inbox now to take a > look at on your end… Thanks - will report back on the outcome, might be of interest here, (If you get this directly as well as to list, let me know :) Tim > p.s. unrelated data point: sent myself an email from this account, it > came over IPv6 with no issues, here's some pudding to prove :-) : > > Received: from mail-ig0-x231.google.com > ([IPv6:2607:f8b0:4001:c05::231]) by alln-inbound-m.cisco.com with > ESMTP/TLS/RC4-SHA; 24 Sep 2014 14:49:23 +0000 > > >> Tim >> >> On 24 Sep 2014, at 13:41, Andrew 👽 Yourtchenko <[email protected]> wrote: >> >>> Tim, >>> >>> Roger that! >>> >>> We're checking internally what's going on. >>> >>> Changing just one nibble in the host portion of the address makes >>> SenderBase score "neutral", so something must be up for that >>> particular /128. >>> >>> When I learn more, will ping you. >>> >>> --a >>> >>> >>> On 9/24/14, Tim Chown <[email protected]> wrote: >>>> My emails to Cisco people are now bouncing. >>>> >>>> It seems the cause is a poor rep on one of our MTAs: >>>> http://www.senderbase.org/lookup/?search_string=2001%3A630%3Ad0%3Af102%3A%3A25e >>>> The DNS reverse seems fine for falcon.ecs.soton.ac.uk >>>> >>>> But the email bounce (with username deleted) says: >>>> >>>> Final-Recipient: RFC822; [email protected] >>>> Action: failed >>>> Status: 5.1.1 >>>> Remote-MTA: DNS; alln-mx-01.cisco.com >>>> Diagnostic-Code: SMTP; 550 Connections from the host >>>> falcon.ecs.soton.ac.uk >>>> (2001:630:d0:f102::25e), originating from SenderBase Network Owner ID: >>>> None, >>>> are being rejected due to a low SenderBase Reputation Score. See >>>> http://www.senderbase.org for more information or contact your IT >>>> support >>>> team. >>>> >>>> If any Cisco people are on this list, please have someone have a look. I >>>> think Andrew Yourtchenko is, and he is one person with bounces. >>>> >>>> Tim >>>> >>>> >> >>
