— buat file sender_access
cd /etc/postfix
nano blacklisted_domains
— isi nya misal ( bisa untuk domain global , atau user account )
abusivecustomer.net REJECT
kucing@customer.net REJECT
— masukan ke Data Base
postmap /etc/postfix/blacklisted_domains
— edit / masukan line berikut di main.cf ( tambahkan diawal baris )
nano /etc/postfix/main.cf
smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/blacklisted_domains, reject_non_fqdn_recipient,
— restart service
/etc/init.d/postfix restart
— test jika email ke kucing@customer.net pasti di reject oleh server
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