>I don't understand this. Specifically, I don't understand "use a 
>current SIMS which can differentiate between return values and 
>choose your blocking that way." I am using 1.8b8. Is that new 
>enough? Is there some setup I have to do in the Router (or 
>elsewhere) to do as you recommend?

Using an RBL with SIMS is a two step process.

First, the desired rbl site(s) must be entered in the RBL Server List 
under SMTP settings:

relays.osirusoft.com "optional text information"

Separately, you must include in your SIMS blacklist the A record that 
is expected to be returned by the RBL lookup. For example, 127.0.0.2, 
which should be returned by relays.osirusoft.com for a verified open 
relay. 127.0.0.3 is supposedly returned for a dialup spam source.

Since SIMS can parse a dash-delimited range of IPs, to be pretty much 
all inclusive you can put 127.0.0.2-127.0.0.10 in the blacklist.

I do not know what minimum version of SIMS you have to have to be 
able to do all this. But I think it's been around for a while.

Stefan Jeglinski

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