Anyone else have problems emailing Cisco? (senderbase)

Andrew  Yourtchenko ayourtch at
Wed Sep 24 14:41:22 CEST 2014


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> 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
> But the email bounce (with username deleted) says:
> Final-Recipient: RFC822; xxxxxxxxxx at
> Action: failed
> Status: 5.1.1
> Remote-MTA: DNS;
> Diagnostic-Code: SMTP; 550 Connections from the host
> (2001:630:d0:f102::25e), originating from SenderBase Network Owner ID: None,
> are being rejected due to a low SenderBase Reputation Score. See
> 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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