Anyone else have problems emailing Cisco? (senderbase)

[Tim Chown]

On 24 Sep 2014, at 18:07, Andrew 👽 Yourtchenko <ayourtch at gmail.com> wrote:

> On 9/24/14, Tim Chown <tjc at ecs.soton.ac.uk> 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 <ayourtch at gmail.com> 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 <tjc at ecs.soton.ac.uk> 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; xxxxxxxxxx at cisco.com
>>>> 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
>>>> 
>>>> 
>> 
>>