I do use SpamAssassin / AMavisd-new on my Postfix server and it's scoring the messages but not enough to trigger anything:
X-Spam-Status: No, score=4.123 tagged_above=-999 required=5 tests=[BAYES_50=0.8, FH_FROMEML_NOTLD=1.082, FREEMAIL_FROM=0.001, HK_RANDOM_ENVFROM=0.001, RCVD_IN_BRBL_LASTEXT=1.449, SPF_NEUTRAL=0.779, T_TO_NO_BRKTS_FREEMAIL=0.01, UNPARSEABLE_RELAY=0.001] autolearn=no
Lots of those rbl spam check clients look way dated and many don't even exist anymore. Just tried to verify a few and they mostly come back dead.
The only ones that appear to still work today are: