Philip, > We have migrated from an Imail topic to an IIS/web hosting DNS > topic.
You're right, and I do think we undersold your understanding of the server part of DNS; if you are running authoritative DNS for your hosted domains on that same server, then obviously the DNS service has to continue running. And even if you don't have a real secondary authoritative server for those domains, that's not our concern now. The question that remains is whether that local DNS server on 127.0.0.1 can perform lookups for domains for which it is NOT authoritative. Such lookups are most often done directly by the server (recursion), but may also be done through designated upstream servers (forwarders), who do the actual lookups and then "secretly" hand the results back to your server, with the client being none the wiser as to the chain of command. But the point in both cases is that doing an NSLOOKUP of remote domains must unfailingly return results, or the server must not be used for mail. > Well, since it appears that the 4 Uunet's DNS servers are less than > reliable, what would prevent me from using some other DNS server? Nothing prevents you from using any public DNS server. I know of quite a few, particularly an old PSINet one that I plug in all over the place for testing, since somehow it's been seared into my brain from some bad episode years ago. The question becomes one of that server's reliability--if it's not from your ISP, then they're not accountable to you if the server goes down or its IP changes suddently--and how far away it is, bandwidth-wise. It's not considered so polite to use another ISP's public DNS, but it's done. If it solves your problem now, and UUNet's servers are that whacked out, then go ahead, but put it in your journal so you'll remember when that foreign server goes AWOL. :) -Sandy To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
