RBL within MailScanner or SA

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Hi, 
I have a question regarding RBLs in MailScanner. Resently some of
my subscritions with some mailing lists are being marked as spam.
In the mail header I see that MailScanner found it on one RBL list,
and therefor marked it as spam.

I was just woundering if it's smarter to be using SA to check these
RBLs, where this checks to see if it's on 3 RBLs before marking it.
Or just whitelist the mailinglist mailserver?

Any best practises here ? I use the default RBLs that is included
in MailScanner config.

thx

---
Trond

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