smtpd_recipient_restrictions in der main.cf erweitern
smtpd_recipient_restrictions= permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_unauth_pipelining, reject_non_fqdn_recipient, check_client_access cidr:/etc/postfix/ip-block
IP-Adressen in das oben referenzierte File schreiben:
echo „62.27.38.63 REJECT Goodby Spammer“ >> /etc/postfix/ip-block
ip-block DB erstellen und Postfix neu starten:
postmap /etc/postfix/ip-block
/etc/init.d/postfix restart
