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    Service unavailable; Client host [xx.xx.xx.xx] blocked using zen.spamhaus.org – fase positive


    The “list” zen.spamhaus.org combines all spamhaus.org’s filters including the PBL
    PBL is a DNSBL database of end-user IP address ranges and this could give false positivs

    Instead you could use: sbl-xbl.spamhaus.org
    Rumors says, When Zen is used solely as the single test to block spam it could lead to false positives.

    Configuration:
    /etc/postfix/main.cf
    Change:
    smtpd_client_restrictions = permit_sasl_authenticated, reject_rbl_client zen.spamhaus.org
    to:
    smtpd_client_restrictions = permit_sasl_authenticated, reject_rbl_client sbl-xbl.spamhaus.org

    Alternatives:
    xbl.spamhaus.org
    sbl-xbl.spamhaus.org
    zen.spamhaus.org
    bl.spamcop.net

    /etc/Mailscanner/spam.lists.conf

    Restart postfix and Mailscanner

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