RBL's without SpamAssassin = how much spam is caught?

[Daniel Straka]

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I'm running MS with "Spam List = ORDB-RBL SBL+XBL" and without
SpamAssassin (my version of perl is too old for SA). Around 15-30
percent of mail is being identified as spam. Some users are still
receiving quite a bit of male enhancement, prescription drug and
software spam.
1. Would SA make a very big difference? If so how much %?
2. Are there other RBL's that work better than Spamhaus?
3. Can I use other RBL's in conjunction with Spamhaus?

Thanks,

Dan Straka
Casper College
(307)268-2399

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