I realize this is slightly off topic, but I've noticed recently that I've been 
unable to preform RBL lookups using the the zen and sbl spamhaus RBL lists. 
Currently using Zimbra Collaboration Suite using CentOS 5 I'm seeing logs 
showing the following output.

[root@phantom ~]# cat /var/log/zimbra.log | grep spamhaus
Jul 18 13:07:12 phantom postfix/smtpd[27001]: warning: 
107.178.203.192.zen.spamhaus.org: RBL lookup error: Host or domain name not 
found. Name service error for name=107.178.203.192.zen.spamhaus.org type=A: 
Host not found, try again
Jul 18 13:07:19 phantom postfix/smtpd[27001]: warning: 
22.178.203.192.zen.spamhaus.org: RBL lookup error: Host or domain name not 
found. Name service error for name=22.178.203.192.zen.spamhaus.org type=A: Host 
not found, try again
Jul 18 13:09:11 phantom postfix/smtpd[28886]: warning: 
107.178.203.192.zen.spamhaus.org: RBL lookup error: Host or domain name not 
found. Name service error for name=107.178.203.192.zen.spamhaus.org type=A: 
Host not found, try again
Jul 18 13:09:16 phantom postfix/smtpd[28886]: warning: 
22.178.203.192.zen.spamhaus.org: RBL lookup error: Host or domain name not 
found. Name service error for name=22.178.203.192.zen.spamhaus.org type=A: Host 
not found, try again
Jul 18 13:15:52 phantom postfix/smtpd[32148]: warning: 
202.200.26.72.zen.spamhaus.org: RBL lookup error: Host or domain name not 
found. Name service error for name=202.200.26.72.zen.spamhaus.org type=A: Host 
not found, try again
Jul 18 13:18:25 phantom postfix/smtpd[1093]: warning: 
26.93.98.14.zen.spamhaus.org: RBL lookup error: Host or domain name not found. 
Name service error for name=26.93.98.14.zen.spamhaus.org type=A: Host not 
found, try again
Jul 18 13:19:29 phantom postfix/smtpd[1093]: warning: 
202.200.26.72.zen.spamhaus.org: RBL lookup error: Host or domain name not 
found. Name service error for name=202.200.26.72.zen.spamhaus.org type=A: Host 
not found, try again
Jul 18 13:25:51 phantom postfix/smtpd[4399]: warning: 
202.200.26.72.zen.spamhaus.org: RBL lookup error: Host or domain name not 
found. Name service error for name=202.200.26.72.zen.spamhaus.org type=A: Host 
not found, try again



After doing some reading I've tried a number of DNS servers ( thinking the 
issue may have been DNS poisoning )  all of which appear to be unable to 
preform dig lookups the spamhaus hosts. Is anyone else seeing similar results?
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