Thanks again mouss. most of my users are in an office network behind a firewall and are using an ms server 2003 dns for local lookups my isp's dns server for non local lookups. My ISP is also hosting the dns records for the postfix server. How can I test if postfix is getting an NXDOMAIN quickly?
mouss wrote: "hard to tell, but a first bet is reverse DNS lookup. if the clients use a private IP space, make sure your DNS server answers for thecorresponding reverse zone so that postfix gets an NXDOMAIN quickly, instead of waiting for dns queries to travel around the world..." _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
