Armando Ortiz wrote: > Dig query returned this: > root at dslcust35:~# dig web40310.mail.yahoo.com @rbl.coloservices.com Heh. It should be dig web40310.mail.yahoo.com.rbl.coloservices.com @rbl.coloservices.com just like with IP-based (ip4set) map. rbl.coloservices.com obviously is not authoritative for yahoo.com zone ;) /mjt