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I was looking at SpamTitan the other day and came accross this info:
The importance of DNS
Accurate DNS responses are vital to SpamTitan maintaining a good spam catch rate. SpamTitan queries multiple internet based spam blocking tools using DNS. Due to the very high volume of DNS requests that originate from free/open DNS servers (e.g 188.8.131.52, 184.108.40.206, 220.127.116.11, etc) the test providers will not respond to DNS requests from these servers. Do not configure SpamTitan to use free/open DNS servers, or if you are using your own DNS server do not configure it to use free/open DNS servers as a forwarder.
In the above, they do not recommend using free/opendns servers as forwarders
I'm wondering how the UTM works with this if you were to put extra RBL's into it. Would using a free/opendns to resolve affect any of these?
What does "the test providers will not respond to DNS requests from these servers" mean?
Cheers - Bob
I think it is saying the problem flow is:
Short version: SpamTitan does not have the resources or the money to provide a free DNS lookup service, but DNS is inherently free. So their workaround is to block Google and Cloudflare and a few others.
Solution: Do what they say or use a different RBL. SpamHaus/Zen and Barracuda are both good options. Barracuda asks for registration. SpamHaus asks for money if you are commercial and doing high volume lookups. but I don't know that they have an enforcement mechanism. MXToolbox.com tracks domain reputation using 65 different RBLs, so you can get a complete list of options there.
UTM can use any RBL. The issue is their attempt to restrict access to their DNS server; the client device does not matter.