Anyone else have problems emailing Cisco? (senderbase)
ayourtch at gmail.com
Wed Sep 24 19:07:21 CEST 2014
On 9/24/14, Tim Chown <tjc at ecs.soton.ac.uk> wrote:
> The IPv4 rep for the same MTA is Good.
> 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...
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
> On 24 Sep 2014, at 13:41, Andrew 👽 Yourtchenko <ayourtch at gmail.com> wrote:
>> 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.
>> 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:
>>> 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
>>> (2001:630:d0:f102::25e), originating from SenderBase Network Owner ID:
>>> are being rejected due to a low SenderBase Reputation Score. See
>>> http://www.senderbase.org for more information or contact your IT
>>> 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.
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