Anyone else have problems emailing Cisco? (senderbase)

[Bjørn Mork]

Tim Chown <tjc at ecs.soton.ac.uk> writes:

> 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.

It might be related to the second bullet point here:
http://www.senderbase.org/support/#problem=3

  "Your IP exhibits DNS patterns that indicate compromise by a
  SpamBot. Make sure your DNS is configured according to the protocol
  for RFC2821, section 4.1.1.1
  (http://www.imc.org/ietf-smtp/mail-archive/msg00827.html)"

A gold star to anyone who is able to explain what they mean by that,
ignoring the fact that RFC2821 was obsoleted by RFC5321 more than 5
years ago.


Bjørn