You can put something like this into /etc/postfix/main.cf:
Code:
smtpd_recipient_restrictions =
reject_invalid_hostname,
reject_unknown_recipient_domain,
reject_unauth_pipelining,
permit_mynetworks,
permit_sasl_authenticated,
reject_unauth_destination,
reject_rbl_client relays.ordb.org,
reject_rbl_client opm.blitzed.org,
reject_rbl_client list.dsbl.org,
reject_rbl_client sbl.spamhaus.org,
reject_rbl_client blackholes.easynet.nl,
reject_rbl_client cbl.abuseat.org,
permit
and restart Postfix.
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