Using SORBS with Postfix (version 2.3.0 and later).
In your main.cf file (usually /etc/postfix/main.cf) set the following:
  1. smtpd_client_restrictions = reject_rbl_client dnsbl.sorbs.net

Note: the 'reject_rbl_client' restriction should be added to the existing options rather than replacing the current options.

 
   
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