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@jhoff:
online DNS and URL blacklists tend to ban public DNS servers (OpenDNS servers, ISP DNS servers, Google DNS) due to the tremendous amount of queries they receive from them (i.e., they are used by many people at once thus quickly exceed the daily free query limit). Using such public DNS server as a forwarder will result in degraded spam filtering performance, as these online blacklist will not reply to your queries (they time out or return an error).
If you insist on using forwarders, conditional forwarding could be a workaround:
http://vamsoft.com/forum/topic/205/surbl-uriblcom-blacklisting-almost-everything#comment-32
@Krisztián Fekete (Vamsoft):
I assume you're suggesting I should setup conditional forwarders for each dnsbl and surbl I have configured?
I haven't seen the issue in the linked post above (uribl.com is configured to block only 127.0.0.2 responses I see) but I do see an increase in SPAM since I added the forwarders.
Problem is some Comcast video stuff doesn't work correctly if you're using a local DNS server :(
@jhoff: I tried for several and setting up the conditional forwarders fails (An unknown error occurred while validating the server). Sigh.
@jhoff: another possible solution is setting up a local "forwarderless" DNS for ORF and use another one with forwarders for all other services.
@Krisztián Fekete (Vamsoft): Interesting idea - any suggestions on what to use? I'd want to use the MSFT dns service for my domain and something else for ORF.
@jhoff:
Maybe a Microsoft DNS Server of a virtual server (if you have a single server only)? Here are some non-MS alternatives:
http://en.wikipedia.org/wiki/Comparison_of_DNS_server_software
@Krisztián Fekete (Vamsoft): Yeah, I just have a single server - this is "home" e-mail... I'll check some of these alternatives. Wondering if you or anyone else has any experience using an of them (besides MSFT DNS) with ORF?
@jhoff: it doesn't seem like it's possible to tell ORF to connect to a dns server on a particular (non 53) port?
I solved it by setting up conditional forwarders for the comcast domains that needed it - working great!
Hi,
I recall it's recommended to use a local DNS server. I do use MSFT DNS service and always have but I'd like to setup DNS forwarders but recall that being a problem. Is it and if so, why?
Thanks!
Jerry