Anyone else have problems emailing Cisco? (senderbase)

[Tim Chown]

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 :)

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
>> 
>> 

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