So I could in theory using our current dns server create a zone "bl.domain.com" and in the zone have A records for: Spam1.com A 127.0.0.2 Spam2.com A 127.0.0.2 192.168.0.30 A 127.0.0.2
That would work, yes. The "Spam1.com" and "Spam2.com" entries would be rare (they are only used in RHSBL tests, which are not commonly used), but the 192.168.0.30 entry would act like a normal blacklist.
and have my email server use this zone as a "trusted" blacklist?
Is this correct?
"Trusted blacklist" is a term unique to IMail v8's anti-spam -- if you're running your own DNS-based blacklist, it's best to just think of it as a DNS-based blacklist. Normally, you would only go to the extreme of creating a DNS-based blacklist if it was going to be shared with others (whether "others" is other offices, trusted companies that you share the blacklist with, or the whole Internet).
But yet, IMail should be able to use it as a trusted or standard blacklist.
-Scott
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