RBLs getting a lot of spam

[motty cruz]

Hello, recently I am getting loads of spam, more than usual. I have the
following RBLs.

     reject_rbl_client b.barracudacentral.org,
     reject_rbl_client zen.spamhaus.org,
     reject_rbl_client bl.spamcop.net,
     reject_rbl_client all.spamrats.com

any recommendation?

Bayes Headers:

X-Spam-Flag: NO

X-Spam-Score: 3.147

X-Spam-Level: ***

X-Spam-Status: No, score=3.147 tagged_above=-999 required=5.3

        tests=[BAYES_99=4.5, BAYES_999=0.2, HTML_MESSAGE=0.001,

        MIME_HTML_ONLY=0.723, RDNS_NONE=2.013, T_REMOTE_IMAGE=0.01,

        URIBL_BLACK=1.7, USER_IN_WHITELIST_TO=-6] autolearn=no