strange blocking behaviour with zen.spamhaus.org

[Stephen Swaney]

Spamhaus is a subscription server for commercial sites. Please see

On 2/11/13 3:11 PM, Harondel J. Sibble wrote:
> Anyone using zen.spamhaus.org rbl in MS and at the MTA level, n1oticing
> weirdness over the past say week or so?
>
> Here's a couple of MTA level examples I've been seeing
>
>      Feb 11 06:07:14 ranger1 postfix/smtpd[13327]: NOQUEUE: reject: RCPT from
>      alias8.phx2-aud-mta-out5.cnet.com[216.239.122.68]: 554 5.7.1 Service
>      unavailable; Client host [216.239.122.68] blocked using zen.spamhaus.org;
>      from=<newsletters at zdnet.online.com> to=<zdnet at pdscc.com> proto=ESMTP
>      helo=<alias8.phx2-aud-mta-out5.cnet.com>
>
>      Feb 11 07:56:19 ranger1 postfix/smtpd[16391]: NOQUEUE: reject: RCPT from
>      lists.freeswitch.org[198.22.64.215]: 554 5.7.1 Service unavailable; Client
>      host [198.22.64.215] blocked using zen.spamhaus.org;
>      from=<freeswitch-users-bounces at lists.freeswitch.org> to=<help at pdscc.com>
>      proto=ESMTP helo=<lists.freeswitch.org>
>
> These are from mailing lists primarily, and if I check the ip address noted
> in the mxtoolbox blacklist check or enter the ip at the spamhaus site, there
> is no listing, WTF????
>