<IfDefine HAVE_SMTPD_RBL>
  <IfModule !mod_smtpd_rbl.c>
    LoadModule smtpd_rbl_module    extramodules/mod_smtpd_rbl.so
  </IfModule>
</IfDefine>

<IfModule mod_smtpd_rbl.c>

    # Define whitelist and blacklist chains for mod_smtpd_rbl
    #SmtpWhitelist mywhitelist
    #SmtpBlacklist myblacklist

</IfModule>