RBL in mailscanner and spamassassin

Martin Hepworth martinh at SOLID-STATE-LOGIC.COM
Tue Aug 16 08:23:59 IST 2005

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kfliong wrote:
> Hi,
> As most of us are already using RBL at MTA level, do we still need to 
> use RBL in mailscanner and spamassassin? I think not as this would waste 
> time doing triple RBL check.
> So, we need to turn off RBL in both mailscanner and spamassassin.
> In Mailscanner.conf, I set
> Spam List =
> to disable RBL.
> Then in spam.assassin.prefs.conf, I have
> skip_rbl_checks    1
> This will skip RBL checking on both mailscanner and spamassassin. So now 
> my question is, would SURBL be turned off if I put that statement above 
> on spamassassin? Because I want to leave SURBL on as it can filter some 
> more RBLs that my MTA level RBL can't detect.
> Thanks in advance.
> ------------------------ MailScanner list ------------------------

I use the RBL's in Spamassassin as I find it less prone to FP's. 
Julian's recent changes so MS can be told how many of it's RBL checks 
should be triggered before MS treats it as SPAM helps alot against FP if 
you are doing ther RBL checks in MS.

As to doing it in the MTA , I prefer not to do this here for the same 
reason, but instead only allow valid email addresses in, this drops 
overs 66% of my traffic with no FPs.

NB: FP = False Positives. Something I care about alot as the previous 
solution to MS we had was very FP heavy!

Martin Hepworth
Senior Systems Administrator
Solid State Logic Ltd
tel: +44 (0)1865 842300


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